#4 Nemanja Matic to Chelsea for £21m
Serbian midfielder Nemanja Matic signed for Chelsea in 2009 from MFK Košice for a fee around £1.5m on a four-year-contract. But he failed to make it into the first team and was later loaned out to Vitesse Arnhem before he was shipped off to Benfica in 2011 as a part of the deal that saw David Luiz arrive at Stamford Bridge for the first time.
In his three years under manager Jorge Jesus, Matic was converted from a playmaker to a defensive midfielder and played a key role for the side. The Serbian won the Primeira Liga Player of the Year award in 2013 and it didn’t take long for his former employees to come knocking.
Matic returned to Chelsea in 2014 for a fee of £21m and has been a key member of the squad ever since. He played a vital role in the club’s 2014-15 league title winning campaign under Jose Mourinho and was also named in the PFA Team of the Year.