Mourinho, who returns to Chelsea today with his team on a six-match unbeaten run, says he remains proud of his trophy-laden achievements at Stamford Bridge.
The United boss said: “Chelsea have won four Premier League titles in their history – three of them were won with me and the other one was won by the team I left behind.
“I took them to Wembley, I took them to Cardiff, I took them to cup finals.
“So there is a connection based on empathy – but built on success. In the end at Chelsea, when the last two or three months of my time at the club were a period of bad results, the fans kept that empathy and they remembered our relationship.
“That is something I don’t forget and is something I will always be grateful to them for as, with me, they always behaved in a fantastic way.
“But there is one thing that Chelsea fans can be sure of now – I am Manchester United 100 per cent.
“I want to win with United and make them the best, but I will always be respectful to Chelsea. It doesn’t matter what happens, I will never lose the feeling of respect towards the club.”