Portuguese manager Mourinho led Chelsea to back-to back titles in his first spell in West London. And, with his second coming to Stamford Bridge, blue could be the colour once again this season as Chelsea look well-equipped to become Premier League champions.
The West London side also have the players in their ranks that could go on and complete the treble. The self-proclaimed 'Special One' has the ability to get the best out his players and instill confidence in his squad.
Chelsea's midfield ace Oscar praised Mourinho's previous success with the Blues this week, telling the club's official magazine: "He is one of the best coaches in the world. We have seen he has already had a lot of success at Chelsea and I am just really happy to have the opportunity to work with him.
"As early as pre-season we could see the belief with which he works. We could see the confidence he has with us as players but also the confidence within his own work. It is clear to us that he is a great coach."
With Manchester United facing the hangover from Sir Alex Ferguson's retirement, new manager David Moyes is going in there for the first time and that brings its own pressures.
You look at Manchester City and their new boss, Manuel Pellegrini, hasn't won any silverware. Arsenal's trophy cabinet has remained shut for the past eight years and Tottenham are relative newcomers in the title race.
Mourinho has been there and done it and, at this stage, that could be the difference between the main contenders in the title race.
Former England international Alan Shearer is backing the West London team this season. The Match of the Day pundit told BBC Sport: "He (Mourinho) knows what the Premier League is all about, he knows how to win it, he knows what it takes and that is why I would go for Chelsea right now."
Frank Lampard, John Terry and Ashley Cole have one more year of exceptional service to give Chelsea and the Blues have a midfield of steel with creative players such as Juan Mata, Eden Hazard, Oscar and Andre Schürrle who will play behind the main striker.
Chelsea are looking deadlier than ever, especially after Mourinho's £32million summer purchase of Brazilian attacking midfielder Willian from Anzhi Makhachkala.
Chelsea have won many trophies during the Roman Abramovich era, and have even managed two doubles in this time. A team winning a treble is not a regular occurrence by by any means, it requires dedication by the players and manager and almost an unbroken run of good form and fortune.
With the return of 'The Special One' and a strong, creative side with a lot of depth, the treble could well be in Mourinho's reach.
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