After an almost flawless first half of the domestic season, the Citizens' form has dipped in 2012 as African Cup of Nations call-ups have been followed by injuries to key players.
City have dropped 13 points this year and Mancini is looking to ensure that he is more prepared for a demanding fixture schedule in the next campaign.
"Maybe next year if we lose two important players, we can have another two good players and we can change.
"We finished our job to build a strong team. Now it's enough to put in three or four more players with a strong mentality."