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#3 Radamel Falcao (AS Monaco to Manchester United and Chelsea)
At FC Porto and then Atletico Madrid, Colombian striker Radamel Falcao was one of the most sought-after strikers in world football. The striker moved to AS Monaco where he settled in quickly before a serious knee injury caused problems for him. In a bid to play in the 2014 FIFA World Cup, Falcao was rushed back.
The striker secured a deadline day loan move to Manchester United, where he was to earn around £265,000 weekly. His deal included an option to sign permanently for £43.5 million, and the club paid £6 million for the loan deal.
Falcao made 29 appearances for the club and scored only four goals, leading to the Red Devils' refusal to sign him permanently.
After returning to Monaco, Chelsea decided to pay £4 million to sign Falcao on loan with a £38 million option to buy. The Colombian was paid £170,000 weekly, and made only 12 appearances for the club. He scored only one goal before his loan was terminated.
Falcao currently plays for Rayo Vallecano in La Liga. The 36-year-old striker remains one of the most important players for the side.
#2 Ricky Alvarez (Inter Milan to Sunderland)
Argentine winger Ricky Alvarez is remembered by the Sunderland faithful as one of the worst signings in their history. He joined the club from Inter Milan on loan in September 2014.
Alvarez joined Sunderland as the club looked to beat the drop from the Premier League. A clause to sign him permanently was included in the deal, with the condition being that Sunderland had to avoid relegation.
Alvarez suffered a knee injury during his loan spell that limited him to only 13 games for the club, but Sunderland avoided relegation and were forced to sign him permanently. The Black Cats entered into a legal battle with Inter and lost at the CAS. They ended up spending up to £20 million in compensation.
Alvarez never played for Sunderland again, as his contract at the club was not renewed after his loan deal. He later joined Sampdoria on a free transfer.
#1 Alexandre Pato (Corinthians to Chelsea)
Brazilian striker Alexandre Pato was a teenage sensation when he broke out as a rising star in Brazil. The striker enjoyed a brilliant goalscoring spell in Italy with AC Milan before injuries derailed his career.
Pato joined Chelsea in January 2016 on a loan deal from Brazilian giants Corinthians, but the Brazil international made only two appearances for the club.
He scored one goal for the London-based side from the penalty spot against Aston Villa. Chelsea refused to sign the striker permanently after his loan spell at the club came to an end, and he returned to Corinthians.
Pato saw a promising career go downhill due to a number of niggling injuries. Still only 32 years old, the striker currently plays for Orlando City FC in Major League Soccer.
