The Portuguese manager returns to Stamford Bridge six years after his first spell and more or less proved to be nothing but successful in his two spells since delivering two Premier League titles for the Europa League champions.
The competition was fierce and to win a title against what some people describe as the greatest club side of all time, greater reflections might be more flattering to Mourinho's spell at the Santiago Bernabeu.
After Roberto Di Matteo claimed the Champions League last year as interim manager, Roman Abramovich completed the set and finally landed the holy grail that he had coveted so highly for so long.
Upon that famous victory in Munich, ambitions were reassessed, and Chelsea needed to reevaluate their strategy moving forward, looking at a more sustainable plan that could ensure the club develop a way of returning to the pinnacle of European football time and again.
While Chelsea fans will be absolutely delighted with the appointment, there were plenty of other outstanding candidates who would have been better choices for the Blues.
While trophies are important, this appointment surely needs to provide more—defining a footballing philosophy and club identity that the supporters can be proud of, youth development and integration, not to mention an ability to work with lesser resources over time and maintain high standards on the pitch.
Here are three candidates who might have been a better choice for Abramovich.