5) Nemanja Matic (Benfica to Chelsea – £21m)
There were a lot of players we considered for this fifth spot, including the likes of Ruben Dias, Rui Patricio and even David Luiz but Matic’s move to Chelsea in 2014 coincided with a period of success for the Blues.
The Serbian won his first league title under Jose Mourinho in his first season back in England, while he won his second championship just two years later with Antonio Conte.