He is not worried by warnings that you should never go back in football.
"Don't say that to Jupp Heynckes," Mourinho told the Sunday Mirror. "Because he went three times to Bayern Munich and the third time he won the treble.
"So, don't say, 'Don't go back' to Heynckes unless you want to say to me that I have to leave again and come back for a third time! I want to think we know each other very, very well at Chelsea. The club knows me, I know the club. I don't think this should work negatively.
"This should be a plus, not a minus. It should be something to help us to do well and not the other way.
"From an emotional point of view, I feel I am coming back. It's my dug-out, the dug-out where I never lost a match, it's my stadium, it's my dressing-room, it's Cobham, it's my office, it's my same table. But, from a professional point of view, it's not different to arriving at a new club - the same ambitions.
"But when, at the same time, I want to leave Real Madrid, I want to come to England and Chelsea is waiting for me and happy for me to come, of course, it is emotional because it is the only decision I can make."