#4 Radamel Falcao (Signed for £51m): AS Monaco to Manchester United & Chelsea
Poor Radamel Falcao. After a knee injury in early 2014 ended any chance of representing Colombia at the World Cup in Brazil, the AS Monaco striker looked for a springboard to get back into the big time.
Monaco's owner, who had pumped in money to make them a competitive Ligue1 outfit, couldn't do so any more due to a very messy and expensive divorce (to the tune of £2.7bn). And players on high wages such as James Rodriguez and Falcao had to be taken off their books.
That was when he had the opportunity to move to the Premier League. Enter Manchester United who signed him on a one-year deal worth £16m. It turned out to be a disaster.
Falcao was never the same player who made a name for himself at Porto and Atletico Madrid, and he scored just four goals in all competitions with the Red Devils.
Jose Mourinho then took a punt on him at Chelsea and he scored just once in 12 games (all competitions). Five goals in two painful years.
Luckily for him, he found his form once he was back at Monaco, averaging 27 goals in the past two seasons since.