"I should have left at the end of last season," he said. "I had an offer from one of the greatest clubs in Europe, but I promised the (Chelsea) fans that I would not leave on my own initiative. I made a mistake and four months later I was fired."
Mourinho also spoke about rejecting the England job: "It wasn't the point that it was team England, just that I'm not 60, I'm 45. I want a game every week, or even better, three times a week."
He admitted he will return to work, in either Spain or Italy, in time for next season.