#9 José Mourinho
Tenure: 3 June 2013 - 17 December 2015 (928 days)
Matches: 136
Matches won: 80
Matches lost: 27
Win %: 59%
Honours: 2015 Football League Cup, 2015 Premier League
The return of the 'Special One', only this time it was not a happy return. Mourinho's first season after the return was rendered trophy-less and a few loyalists also questioned his decision to sell their two-times consecutive Player of the Season, Juan Mata, to arch-rivals Manchester United.
He made up for it though in the next season, winning the League Cup and the Premier League title with three games to spare, along with the stellar signings of Diego Costa, Cesc Fabregas and Thibaut Courtois.
The season after that turned out to be his last, as he lost the dressing room, especially the form of talisman Eden Hazard. On top of that, his off-field controversies, especially with team doctor Eva Carneiro, further fueled his exit.
On December 17, 2015, after a string of heavy defeats and Chelsea languishing closer than ever to the relegation zone, Jose Mourinho was fired from his post, thus ending the romance between him and Chelsea.