10. Willian to Chelsea - £30m
Premier League giants Chelsea landed the prolific Brazilian from Russian side Anzhi for £30million.
The Blues made a late bid for the midfielder who was poised to join rivals Tottenham, but the player chose to come to Stamford Bridge at the last minute.
Willian himself seems happy with the move and would be successful if his performances match his fees.
Chelsea have a roster of young talented midfielders and Willian has to really be at his best to impress Mourinho to guarantee a starting spot.