The world of football transfers is full of errors; no club can get it 100% right the whole time. However, some clubs have more of a track record of failure than others -- whether it's spending mountains of cash on one player (Real Madrid), consistently making poor decisions in certain positions (Man United), or handing your megastar a new contract just before his form goes out of the window (Arsenal).

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Since 2010, Europe's top clubs have all done something wrong. Here's a look at some of the biggest mistakes in the transfer market over the past decade.

ARSENAL: Spending £72m to sign Pepe

When there is an internal investigation over whether you overpaid for your club-record signing, you know it's bad. The £72m fee was reportedly spread over five years, which allowed Arsenal to sign Nicolas Pepe but also saddled them with debt, while the winger has not lived up to his price tag on the pitch. Raul Sanllehi departed as Arsenal's head of football shortly after news of the investigation came out, but he had already offered the 32-year-old Willian a three-year contract, while 29-year-old back-up full-back Cedric Soares got four years. Both of those decisions were worse than giving the now-exiled Mesut Ozil a new contract worth around £350,000 a week (making him the highest-paid player in the club's history) back in January 2018.

A close second: One could argue that you have to go back to 2016 under former manager Arsene Wenger to find Arsenal's poorest transfer decisions: letting Serge Gnabry go and signing Granit Xhaka (£35m), Shkodran Mustafi (£35m) and Lucas Perez (£17.1m) that same summer. Gnabry was allowed to join Werder Bremen for around £5m and has since moved to Bayern where he has become one of the best in the world, while the trio who arrived have not impressed. Wenger also allowed Robin van Persie to move to Man United in 2012 for £24m, where the injury-prone striker immediately won them the title, but nobody could have predicted that one.

Barcelona overpaid. Liverpool dug their heels in when Barcelona came calling in the summer of.

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BARCELONA: Spending over €420m on four players

Barcelona's debt has doubled to €488m amid the COVID-19 pandemic, but there has been a fair amount of financial mismanagement at the heart of the club for many years. Just look at some of the transfer fees spent on players who haven't worked out. Atletico Madrid were handed €120m for Antoine Griezmann in 2019, for which Barca had to take out a loan; Malcom cost €40m from Bordeaux a year earlier; Ousmane Dembele (€105m) and Philippe Coutinho (€160m) have flopped. Add in a host of other expensive players who made little impact, including Arda Turan, Paco Alcacer and Andre Gomes, and it's not hard to see why the club find themselves in such a precarious financial position.

A close second:Letting Luis Suarez depart for a direct rival for nothing this summer was not the smartest move. Firstly it annoyed his best friend, Lionel Messi, then the way it was handled was a PR nightmare, and finally the 33-year-old has gone and scored eight goals in 11 games to take Atletico top of La Liga, while Barca are in crisis.

BAYERN MUNICH: Signing Sanches from Benfica

Bayern have always been mindful of sticking to their budget; only Lucas Hernandez's €80m arrival from Atletico Madrid in 2019 broke the €40m transfer record set by Javi Martinez back in 2012, and they rarely splash out on big signings. But Renato Sanches could have eclipsed both if his €35m move, with another €45m in add-ons, from Benfica had gone as planned in 2016. Bayern did well to make sure they didn't pay everything up front, as the Portuguese teenager flopped and ended up on loan at Swansea, but they also took a terrible gamble on an 18-year-old.

A close second: The aforementioned Lucas deal hasn't exactly gone to plan either, with the Spain international not proving very good value for money. While Mario Gotze's €37m move from Dortmund seemed a good idea at the time, he never lived up to expectations (although he still won seven trophies during his three years at the club).

BORUSSIA DORTMUND: Letting Lewandowski leave on a free

Dortmund have done pretty well in the transfer market in recent years, bringing in the likes of Erling Haaland, Jadon Sancho and Giovanni Reyna for virtually nothing. But there was a time this decade when they couldn't stop rivals Bayern from taking their best players: Mats Hummels, Mario Gotze and the jewel in the crown, Robert Lewandowski. Since he left Dortmund in 2014, the Poland striker has become one of the best of all-time, and the worst part is that he moved on a free transfer. Dortmund had a chance to get him to sign a new deal, but they failed and have been regretting it ever since.

A close second: Germany winger Andre Schurrle joined Dortmund in 2016 for around €30m but failed to impress and was sent on loan to Fulham and Spartak Moscow. He then announced his retirement at the age of 29, before his contract was up, in 2020. That summer also saw Gotze return from Bayern for €22m, which also didn't work out.

CHELSEA: Letting De Bruyne and Salah go

Chelsea agreed a £7m deal with Belgian side Genk for midfielder Kevin De Bruyne in January 2012, and he headed off on loan to Werder Bremen for the 2012-13 season. After impressing in the Bundesliga, his return to England would surely give him a chance to shine, right? Wrong. Manager Jose Mourinho didn't see his talent, and by January 2014 he had been allowed to move permanently to Wolfsburg for around £18m. Just 18 months later, Man City paid around £55m to sign him and now he's the best attacking midfielder in world football.

Sadly for them, Chelsea did not learn from that mistake. In January 2014, the Blues announced an £11m deal to sign a relatively unknown Egyptian winger called Mohamed Salah from Swiss side FC Basel, but three years later, with only 19 games and two loan spells at Fiorentina and Roma under his belt, he joined Roma for around £12m. One incredible season later, Liverpool came calling for around £36.9m and turned him into one of the best forward players in the world. Just imagine what Chelsea could have been with Salah and De Bruyne on the same team...

A close second: Imagine spending a world-record sum of £71.6m for a goalkeeper and for that goalkeeper to then be a backup just two years later. Kepa Arrizabalaga started off well at Chelsea after arriving from Athletic Bilbao in 2018, but his form has dropped off a cliff in recent months, which was enough to persuade the club to spend £20m on Rennes' Edouard Mendy. The Senegal international kept 10 clean sheets in his first 16 appearances -- matching the same number made by Kepa in 45 matches under Frank Lampard.Chelsea have form in this area -- spending £60m to sign Alvaro Morata, £50m for Fernando Torres, £40m for Tiemoue Bakayoko, £35m for Danny Drinkwater, £33m for Michy Batshuayi -- so the fans can't say they didn't see the failure of a big-money signing coming.

JUVENTUS: Signing ex-Arsenal players

Juve's relationship with Arsenal over transfers is an odd one. Having let them sign Thierry Henry for a mere £11m in 1999 (before the Gunners turned him into one of the best players in the world), the Italian side have not found much success bringing players the other way. The legendary Patrick Vieira arrived in 2005 but lasted only one season before moving to Inter Milan, while over the past decade the list gets worse. Armand Traore (2010), Nicklas Bendtner (loan, 2012) and Nicolas Anelka (2012) set the tone before a rather odd deal to take young English striker Stephy Mavididi (2018) saw him make just one appearance in two years. Only goalkeeper Wojciech Szczesny (2017) and Aaron Ramsey (2019) can claim to have had any kind of success in Turin having previously played at Arsenal.

A close second: Juve have a bit of a reputation for landing top players on a free transfer, but Barcelona's Dani Alves was not a success. The Brazilian full-back spent one season at the club, but didn't impress before he broke his leg, and in 2017 he posted a picture on Instagram of the boots he wore in the 2015 Champions League final (when Barcelona beat the Bianconeri 3-1) that provoked an angry reaction from the Juve fans. Not long after, he joined PSG for nothing.

LIVERPOOL: Replacing Torres with Carroll

Fernando Torres was a legend at Liverpool, and his 81 goals in 142 games during his four-year spell were never going to be easy to replace when he joined Chelsea for £50m in January 2010, but making Newcastle's Andy Carroll the most expensive British footballer at the time was not the way to do it. It was a panic buy, and while the signing of Luis Suarez from Ajax helped bridge the gap somewhat, the Reds went through a tough time -- plus £40m of Christian Benteke and £15m of Mario Balotelli -- before Carroll left in 2014 and Roberto Firmino eventually came into his own under Jurgen Klopp.

A close second: Signing relatively unknown goalkeeper Loris Karius from Mainz for £4.7m in 2016 seemed an OK move, as nobody thought he would rise to become No. 1. He did, and that decision ultimately cost Liverpool the 2018 Champions League final against Real Madrid, as his meltdown put paid to his Anfield career.

MANCHESTER CITY: Signing Mangala

When Man City landed Eliaquim Mangala for £42m from FC Porto in 2014, it seemed like a statement of intent -- the big-spending club making the Frenchman the most expensive defender in British history. But with 79 appearances for City in four years before leaving for Valencia on a free transfer in 2019, it was a disaster. 'I found a league that is very tough,' he later told The Athletic. 'It was totally different to what I knew before. It was very intense.'

A close second: Choosing Wilfried Bony over Paulo Dybala was also a pretty poor decision. Edin Dzeko's 2015 exit to AS Roma left a hole up front, but instead of signing the man dubbed 'the new Sergio Aguero' from Palermo, City opted to put £28m down for Swansea's Bony. The Ivory Coast international scored six goals in 26 league games before heading back to Swansea for half what City paid and is now looking for a new club after leaving Saudi Arabian side Al-Ittihad. Dybala joined Juve and has become a global star.

MANCHESTER UNITED: Letting Pogba join Juventus and buying him back for £89.3m

Sir Alex Ferguson didn't make too many mistakes in general, let alone in the transfer market, but allowing Pogba to join Juventus in 2012 probably was his biggest. The reason? Ferguson claimed in his 2015 book that 'there are one or two football agents I simply do not like, and Mino Raiola, Paul Pogba's agent is one of them. I distrusted him from the moment I met him.' United picked up £800,000 in compensation but were forced to spend £89.3m to re-sign the midfielder four years later in 2016. While the French World Cup winner is still one of the best players around when he wants to be, United probably could have done without the circus that has followed him in recent years. He may yet return to Turin, but United won't get half the price they paid.

A close second: Ferguson also made a monumental error of judgement in the £7m signing of Bebe in 2010, despite never having seen him play. The Portugal forward made only two appearances before leaving for Benfica in 2014, and United's attempts to find a long-term replacement for Ryan Giggs included a host of expensive flops: Wilfried Zaha (2013), Angel Di Maria (2014), Memphis Depay (2015) and Alexis Sanchez (2017). The swap deal that brought Sanchez to United and sent Henrikh Mkhitaryan to Arsenal is probably the worst in history, but both clubs suffered so it's hard to pick a winner.

PSG: Spending €222m on Neymar

At first glance, this kind of spending power is pretty impressive. It lays down a statement if nothing else. But €222m is a ridiculous amount to spend on a player, and realistically the club's 2017 decision has had massive ramifications across the European market ever since. For starters it ruined the concept of a low buyout clause, meaning that squad players like Barcelona's Martin Braithwaite have clauses set at around €300m. It made Barca sloppy in forking out huge sums for Malcom and Griezmann, contributing to their issues (see above). And it helped push pre-COVID-19 prices up so far that Harry Maguire (€87m) was worth more than Virgil van Dijk (€84m), while Arsenal's €80m to sign Nicholas Pepe was €4m more than Man City had to pay for Kevin De Bruyne. It just makes no sense. Worst of all, it didn't even work that well. Yes, Neymar has won Ligue 1 three times in three years, but he hasn't delivered the Champions League and has spent most of the time seemingly angling for a move back to Barcelona.

A close second:The transfer dealings done in 2016 proved pretty poor for PSG. They signed Julian Draxler (€36m), Goncalo Guedes (€30m), Grzegorz Krychowiak (€27.5m), Jese (€25m) and Hatem Ben Arfa (free). All of those players flopped. And it was also the year they let Zlatan Ibrahimovic join Man United.

REAL MADRID: Spending €100m on Hazard

Selling Cristiano Ronaldo to Juventus in 2018 could be construed as a mistake, given his incredible scoring record since. But Ronaldo was 33 years old and Madrid got €100m for him, so really they did very well out of the deal. They even managed to land No. 1 target Eden Hazard from Chelsea for around the same amount -- although some reports have claimed they may end up paying up to €160m for the Belgian. However, injuries have hampered the winger, and he's only managed three goals in 29 games in 18 months. He has time to turn things around, but right now he looks like a very expensive mistake.

A close second: Madrid have form here too, with James Rodriguez (€75m), Luka Jovic (€60m), Asier Illarramendi (€40m), and to a lesser extent Mariano Diaz (€21.5m), Brahim Diaz (€17m), Lucas Silva (€13m) and Nuri Sahin (€10m), all having their careers derailed after a move to Madrid.

TOTTENHAM: Failing to spend the Bale money wisely

Gareth Bale left Spurs for Real Madrid in 2013 and £85.3m went into the club's accounts. But that cash was used on Roberto Soldado, Paulinho, Etienne Capoue, Vlad Chiricheș, Nacer Chadli, Erik Lamela and Christian Eriksen. After selling Bale, Spurs didn't reach the Champions League for another three years, and only Eriksen could be considered a unqualified success -- although Lamela has had his moments and, unlike any of the others listed above, remains at the club.

A close second: Go back to 2012 and Harry Redknapp wanted to sign Carlos Tevez and Gary Cahill in January to challenge for the title, but he brought in Louis Saha and Ryan Nelsen on free transfers instead. That was a missed opportunity, and Spurs haven't had much luck in the striking department since. Harry Kane's arrival on the scene in 2014 -- following loan spells at Leyton Orient, Millwall, Norwich and Leicester -- was an immediate boost to the strikeforce, and his 204 goals in 310 appearances suggest the club won't need to find another main striker for some time. However, they have struggled to find a reliable backup for the England international. Soldado (£27m), Vincent Janssen (£19m) and Fernando Llorente (£14m) have all had issues, meaning a loan move for Carlos Vinicius seemed the best option this summer.

Adding gym work in to your regimen as a footballer is something I feel is still neglected, and when it is done, is usually all wrong. Today I’m going to break down some common mistakes people make when they are training for football (soccer, not Gridiron).

When most people first hit the gym, 99.9% of the time, the reason behind it is because they want to look better naked. If you’re a (normal) young man, you decide you want to get wedge, maybe like The Rock. If you’re a pum-pum, you want to get ‘toned’ like a Hollister model.

However, achieving the aforementioned ‘wedge’ look requires a certain style of training, usually very distinct from how to train if you’re a footballer aiming to get swift, strong, and unbeatable. Therefore, if you’re a footballer, you need to resist the temptation to train like everybody else. It’s easy to get sucked in – popular Youtube personalities, resident ‘bros’ at the gym, internet forums/blogs/sites, but ultimately you must always look at your goals to define the way you should train. Training like a bodybuilder may end up wiping out your athletic ability.

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Now I am in no way suggesting that there is only one right way to improve your athleticism, but there are certainly many wrong ways to do it. (Also, I’m in no way suggesting you can’t look good while training like an athlete – in fact, you’ll end up looking great.)

So without further ado, the top 7 mistakes people make when they’re training for football.

1. Doing a body-part split (aka ‘bro-split’)

When training for football (or any sport for that matter), the body should ideally be trained as a unit, an integrated machine. Of course, you’ll have to do isolation movements here and there to shore up your weaknesses, but by and large you should be focus on compound movements that work lots of muscle in one movement, adding in some accessory movements as appropriate.

A standard ‘bro’ workout for chest might look as follows:

• 3 x 12 cable flyes
• 3 x 12 bench press
• 3 x 12 pec-dec
• 3 x 12 decline bench press

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Don’t do this – it will do nothing for you if you’re an athlete who has to train and play games. Train using either full-body workouts, or an upper/lower split.

Furthermore – to really make progress, you have to get more frequency in – and with bro splits you can only really train each body part once weekly. Using upper/lower or full body workouts you can train twice or even thrice weekly, depending on your schedule, recovery ability, diet, etc. Once you’ve started the season, doing body-part splits is pretty much useless and unfeasible anyway.

2. No max strength work

Bodybuilding programmes usually do not include any appreciable amount of maximal strength work – meaning in the rep range of 3-5 reps. Usually this is because sets of under 5 reps aren’t the most effective in building muscle. However, training in this rep range is extremely important as an athlete, because it trains your fast-twitch fibres – the muscles that seperate the Mertesackers from Ronaldos.

Maximal strength is the foundation for power, and without beating a dead horse, you need power if you want to become a boss. Maximal strength is only one type of quality on the speed-strength continuum, along with speed-strength etc, but most people new to the gym are weak and lacking in this quality, so any work done here will usually hugely benefit on-pitch performance.

There is a time and place for bodybuilding exercises – but it shouldn’t be the emphasis of your training. That’s not to say you should train like a powerlifter either – I prefer a mix of the two, something that has yielded success for many athletes and coaches (such as Joe de Franco).

3. Neglecting bodyweight moves

Bodyweight movements are HIGHLY underrated and seriously overlooked within the world of strength and conditioning. Usually they’re relegated to something that you do when you want a little pump on the beach. In my opinion, every training program should include a substantial amount of bodyweight training, regardless of the goals. If you’re a beginner to strength training, focus on becoming very good at bodyweight training before you add external loads.

Push-ups, pull-ups, dips, squats, and inverted rows, are all excellent moves that will give you bang for your buck. Get strong WITHIN your body first. Show me a guy who can do lots of pull-ups, squats, and push-ups with excellent form, and I guarantee you that at the very least this guy will be lean and probably very fast.

Anybody who has seen Hannibal For King knows that bodyweight training is not a joke (yeah, he probably has great genetics yada yada yada, but who cares?). You can do bodyweight moves anywhere and everywhere, and no fancy gym is required. Get on this now!

Tell him bodyweight training is useless.. I dare ya

4. Bulking too quickly

This is a huge mistake, universal across all types of training, and one I can identify with FULLY. I unfortunately made this mistake a year ago, gaining approximately 15 pounds (7 kg) of what I thought was muscle, in one and a half months. My shirt size increased and I was excited about my work – however, the increasing size of my stomach was the first warning signal – the death knell was that my performance on a football pitch absolutely sucked.

I could not run, was gassed out after 10 mins, my co-ordination was garbage, and I was bloated.. all.. day.. long. I made the classic mistake of dirty bulking, and went from one of the quickest players in my group to the slowest. I was Gareth Barry, and everybody else was Mesut Ozil.

Thankfully I was able to reverse this, and now I stay relatively lean while still being able to take in more calories and build muscle. Try to aim for a SLOW bulk and only take in slightly more calories than you need – don’t go crazy downing junk food every few hours (my personal ‘record’ is a 14 inch pizza and 2 boxes of Ferrero Rochers.. with a mass-gaining shake).

5. Getting too caught up in the gym

Working out, lifting, and the pursuit of PRs is addictive, I’m not going to lie. Since I began training properly and recording my workouts, I actually get excited about going to the gym. I go to the gym to put in work, and as sad as it sounds, there have been occasions where I’ve actually not been able to sleep because I was so hyped about breaking some record the next day (usually squatting). If you’re like me, you’re an addict. And it’s all good… till it’s not.

These days I only really play football once/twice a week, so I can afford to prioritise the gym a little. However, if you’re playing competitive football (for a team) twice a week or more, you need to be mindful that your gym work doesn’t interfere with your performance – especially if you’re training intensely. The gym should be a supplement to your work, not the main focus.

There will be times you need to back off and do less because you’ve got training and hard games the same week. The meathead lifestyle can suck you in, and the lure of big guns and a chest like Arnold can take you away from your goals. You need to keep the conditioning in there too – don’t use the excuse that it will burn up calories.. you’re a footballer, not a bodybuilder! What good is being strong without the engine to back it up?

6. Not doing your mobility work

I’ve already touched on the importance of mobility work in previous articles. No matter how you train, you need to be doing this stuff, if only to keep you healthy and able to train. If you’re a footballer it’s even more important, because tightness can interfere with your ability to play. Flexible muscles are strong muscles.

Let’s briefly look at the hip flexors, a very common tight area in many people, not just athletes. The hip flexors can get really tight and short from being in a constant state of contraction, i.e. sitting a lot. They’re the muscles on the front of your hips.

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I used to have VERY tight hip flexors and it gets really bad when I’m driving and stuck in traffic, but that has improved since I’ve incorporated mobility work into my training. Strengthening your hip flexors allows you to fully drive your knees upwards when sprinting, and if they’re tight, you won’t be as fast as you should be. Plus you might develop a forward tilting of the pelvis.. never a good look.

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I’ll be making a post soon that focuses on common tight/restricted body parts, complete with sample exercises and solutions.. stay tuned.

7. Not doing your core work

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Doing some crappy crunches or sit-ups doesn’t count as core work. Neither does wearing one of those dud ‘electromagnetic toners’ (shame on you if you ever bought one of these).

Let’s classify the core as the area between your chest and knees, front and back – it’s not just your abs. Your core absorbs and redistrubutes forces throughout your body – so no matter how strong your limbs are individually, with a weak core, you’re dead. In football, you run, jump, twist, and turn constantly, and the stronger your core, the better you’ll be able to do all this.

A stronger core will give you better balance and the ability to ride through tackles. Don’t get shaken off the ball like a mug.. strengthen your core.

7. Jogging all the time for cardio

Please see my previous article A millions reasons why you should be sprinting. Keep your jogging limited to 1 or 2 very light sessions throughout the week. Anything more than 10 minutes jogging is overkill. Sprint, swim, jump rope, hit the heavy bag, and play football. That will take care of most of your conditioning easily. How many sessions you need per week is difficult to say – it all depends on your schedule and state of conditioning.

Anyway, I hope that helps, and I will definitely be touching on this topic again as there is so much more to say. I’m looking to release a comprehensive guide on this topic in the near future.

Please let me know what you think of the article by commenting below and emailing me at jumpliftsprint@gmail.com.

Peace!