There is certainly no fear factor for City going into this derby as there may have been in years past.
Last season's 6-1 win at Old Trafford and crucial 1-0 victory at the Etihad dealt with that.
Mancini said: "United versus City is a different game now.
"Maybe two or three years ago we were fearful of United last season changed that.
"They are better than us, though, because they have a strong mentality.
"They can play in two strong competitions like the Premier League and Champions League and we probably don't have that strength right now. We need to work for this."