#6 Mesut Özil (£16.2m from Werder Bremen)
Mesut Özil was a raw gem when he arrived in Madrid from Bremen. However, he turned into one of the best playmakers in Europe during his time with the Galacticos.
The German owes a lot of what he is today to the Portuguese manager and the faith he put into him at the time. Özil developed into an assist machine at the Bernabeu, assisting 81 goals in his 159 appearances for Los Blancos.
The impact of the playmaker was so influential, that his departure in 2013 caused a huge controversy, with Cristiano Ronaldo of all people severely criticizing the club for letting him go to Arsenal.
The Portuguese superstar knew that he was losing his main source of assists and made it well-known that he's unhappy. Özil became a star under Mourinho and, should he not sign a new contract at Arsenal, you can expect the Special One to make him his primary target in the summer.