It is a fourth visit to the national stadium for City in just over two years after the semi-final and final of 2011 and the Community Shield match of the same year.
Mancini said: "I think to play at Wembley is fantastic. To play a game there for the FA Cup or Community Shield, with all the supporters there it is a magic moment.
"Wembley is a temple of football. If you play for the FA Cup or for another competition it is always a good game."