#1 Kevin de Bruyne
The dynamic Belgian has been one of Europe's top players this season. In a Manchester City side that has been playing to his strengths, de Bruyne has flourished in their attacking midfield alongside David Silva.
However, de Bruyne would not have been a City player if Mourinho would have held on to him at Chelsea. But due to the Portuguese's excessive and sometimes unrealistic demands, the Belgian decided to make a move to Germany where he achieved superstar status at Wolfsburg.
When de Bruyne was ready to break into Chelsea's first team, the squad was filled with established attacking midfielders such as Eden Hazard, Andre Schurrle, Juan Mata, Oscar, and Willian.
The 26-year-old has no regrets at leaving Chelsea and believes the club don't badly either in letting him go as they won two league titles after his sale.
That being said, since then de Bruyne has become one of the world's finest attacking midfielders, and most top European sides would love to make him a part of their team.
During their days at Chelsea, Mourinho stated that he was unhappy with the Belgian's training regimes and believed he lacked the motivation to make it big, due to which he decided to offload him.
Two years down the line, the Portuguese's statements have come back to bite him as de Bruyne has achieved world-class status at United's local rivals Manchester City.