Mourinho led the Inter Milan team built by Mancini to the Champions League title in 2010.
Mancini said: “I won seven trophies in three years at Inter but not the Champions League – sometimes it is not your moment. You prepare, but in this competition you need luck.
“Jose is one of the best in the world, but people should forget the managers. It’s the players who will decide the game and anything else that happens outside the pitch is not important.”