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Jose Mourinho is Chelsea's most successful manager.
Without Roman Abramovich, it doesn't need to be said Chelsea wouldn't have seen the likes of Didier Drogba, Petr Cech and Fernando Torres at Stamford Bridge. The Russian's billions have bankrolled the club's recruitment drive over the past decade, which has seen some of the world's best players arrive—with the club enjoying unprecedented levels of success.
Without the addition of Jose Mourinho, however, it's hard to say whether the Blues would have enjoyed such a trophy-laden decade. The Portuguese spent three years at Chelsea, arriving from Porto in 2004 having just lifted the Champions League trophy, and he continued that success in West London.
In his first season at Chelsea, Mourinho ended the club's 50-year wait for the league title and moulded the club into a European force.
Indeed, such was his impact, successive Chelsea managers have used his blueprint to mastermind their own glory at Stamford Bridge, thus ensuring his presence remains strong.
Mourinho's tactical nous and knowledge of the game has been just as important to Chelsea in the past 10 years as Abramovich's fortune. They formed a lethal partnership that threatened to dominate English and European football, so it's understandable Blues fans were so distraught when it came to an end.
But with all the signs seeming to suggest the pair may be about to reignite their partnership (via Rob Beasley, The Sun), could this be one decision Abramovich is set to repeat?
If so, it could be the greatest of them all.