The Italian striker joined the Serie A side in January and made an outstanding debut against Udinese last weekend, scoring twice to win the match 2-1 for the Rossoneri in injury time.
Flamini believes the signing of Balotelli could help spur Massimiliano Allegri’s side to win trophies, though called for caution ahead of this weekend’s game.
"The match with Cagliari could prove crucial," he told Milan Channel. "We will face a very good team, but we want to play well and take home three points.
"We have so many quality players though. Balotelli's arrival is fantastic - he has so much potential.
"With him up front we hope to win a lot of trophies."
Flamini was dropped from midfield in the club's dramatic San Siro win over Udinese, but could return to the starting line-up against Cagliari on Sunday.