The City boss has been strongly linked with moves for Radamel Falcao and Edinson Cavani and admits he is hoping to bring some big-name stars to the club during the summer.
Mancini said: "We have time and there are good players on the market. I think that we need to improve our team, but this is normal.
"All the teams every year want to improve. We work for this, and also in our mistakes because we made some mistakes in the season."