The 34-year old Frenchman scored twice on the weekend as City swept past Notts County 5-0 in the FA Cup fourth round replay and Mancini said it would be nice to have a player similar to the ex-Arsenal captain to step into his shoes when he retires from the game.
"He knows the position and it is important that when he plays he plays well," said Mancini.
"It is because of that kind of professionalism that I say we want to find another Patrick. He has won everything and is a good player, but it's not easy for a player like him to play a lot because of his body.
"He is 34 now and the time goes for everyone. Time passes for all players. If we find a player like Patrick for our future it would be fantastic as he was one of the best midfielders in the world for a long time."