The duo worked together during Mourinho's first spell at Stamford Bridge, winning two Premier League titles, an FA Cup and two League Cups over three seasons between 2004 and 2007.
And now Mourinho admits he is looking forward to this weekend's master-versus-apprentice clash as he seeks a return to winning ways in the league following defeat to Newcastle.
"I am very happy to meet Steve Clarke again," he said at a press conference. "He’s a special guy in my career. It’s very difficult to play against his teams because they defend very well.
"This season they stopped Arsenal winning and won at Old Trafford. We stay in touch but not speaking about our jobs directly."
"I think he had a good experience with me. He was more than an assistant coach, he was in control of training, match preparation, so he had a very good experience as assistant manager.
"He knows that every match he plays I am with him and hope he wins, obviously tomorrow that is not the case."
The 50-year-old's praise for his former Chelsea assistant comes after Clarke admitted that working under his stewardship made him a changed man, learning more about the game than under any other former coach.
"The greatest compliment I can give Jose is to say in the time we worked together I changed completely," he told The Sun. I learned more with him than with all the other coaches put together who I'd worked with.
"The day I took leave of him was hard. What is most certain when you start a job as coach or manager is that one day the mission will come to an end."