The Portuguese coach was the guest of honour at the Savoy Hotel just a few hours after watching his side beat Manchester United 3-1 at Stamford Bridge.
He said: "The best thing football gave me was to make a decision about my future.
"Some managers go where they have to go, where the club comes, and sometimes it is not the best move, not what they want to do, but they go.
"I sat down with my wife and family, and said 'where is the best place for us? Where can we be happier as a family? To be happy as a manager and enjoy more the family and life socially?
"We decided England, after that, for the situation to be perfect it would be Chelsea and I was lucky because the door was open for me."
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