#1 Mourinho's trusted lieutenant
Willian was extremely close to a move to Tottenham in 2013 but Chelsea hijacked the move and it is rumoured that Mourinho was the reason he chose to join them instead of their London rivals.
The two enjoy a special bond on and off the pitch and it is there for everyone to see when United play Chelsea these days.
It is a similar bond to what the Portuguese shares with Matic, and the difference he has made to United's midfield this season speaks volumes about Mourinho's astute ability to get the best out of players he knows inside-out.
Willian is one such player - he enjoys a special page in Mourinho's books and the chemistry between the two will be reflected on the pitch and can prove to be the driving force in United's quest for glory next year.