#8 Nemanja Matic (£22.5m from Benfica/£40.23m from Chelsea)
If Mourinho had to describe his perfect player, Nemanja Matic would probably suit the description very well. The Serbian is tall, strong and most importantly he plays with his head as much as he does with his feet.
The Special One's teams have always been built around physical prowess and tactical cleverness and it's no surprise that he immediately jumped at the opportunity of signing Matic for United as soon as Chelsea made him available.
Matic joined up with Mourinho during the manager's second stint at the London-based club and his powerful presence in midfield played a significant part in their title-winning campaign in 2014/15. However, like Ferreira, he fell out of favor as soon as the Portuguese left.
Reunited with his former manager at Old Trafford, Matic appears to be the missing piece to unlock Pogba's full potential. Furthermore, his ball-winning abilities provide the attacking players with the confidence to take necessary risks.