Jose Mourinho says he has returned to Chelsea because he wants to leave a long-lasting legacy for the first time in his managerial career.
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The 50-year-old Portuguese has achieved success wherever he has coached, but he has never remained with a club longer than the three years and three months he spent at Chelsea in his first spell between 2004 and 2007.
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He returns to Stamford Bridge, on a four-year contract, having won a further eightm trophies with Inter Milan and Real Madrid, but says he now wants to sow the seeds of long-term success.
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"You need stability for identity, and I think identity becomes more important in football," he told reporters after being officially presented to the media on Monday.
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"You need stability if you want to go in this profile direction. If Chelsea bought lots of young players, those players need to be developed.
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"With Financial Fair Play, and Chelsea wants to go in that direction, you also need stability. You cannot change manager and philosophy every few years.
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"It's more difficult to keep trying to win and trying to be successful, while at the same time developing young players while giving an identity to the team.
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"But it's something I want at this stage of my career. Titles I have. Money I have. I need challenges."
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While Mourinho was at Madrid, Chelsea ended owner Roman Abramovich's nine-year quest for Champions League glory by prevailing over Bayern Munich in the 2012 final.
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They followed that up with success in the Europa League under interim coach Rafael Benitez, but Mourinho says the club must aim higher.
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"I think Europa League winners can be analysed in two ways: one way, you won it; the other way, why did you win it? Because you didn't get through the group phase of the Champions League," he said.
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"The point is we have to prepare ourselves to win, or not to win, but our target level is not Europa League.
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It's the Champions League and the Premier League."
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Mourinho inherits a squad rich with talented young players such as Eden Hazard, Oscar and Victor Moses, but he also faces awkward decisions about how to handle the old guard.
Let him stop telling the press what he wants to do and do it already. He is there let him display his coaching skillz.