Balotelli's future at the San Siro has been the subject of constant speculation this summer, with Arsenal rumored to be interested in the former Manchester City forward.
However, Galliani has clarified Balotelli's situation, claiming the Italy international has not asked to leave Milan and that he expects him to remain with the Rossoneri.
"Mario is training like the other players," said Galliani. "He never asked to be sold.
"He will stay at Milan. One hundred per cent doesn't exist on the transfer market, but 99.9 per cent does."
Galliani also admitted that Milan are interested in Arsenal forward Joel Campbell, who has been mentioned as a possible swap in a deal for Balotelli, and Torino winger Alessio Cerci.
"Alessio Cerci and Campbell? They have the characteristics our coach likes, but so do many other players," added Galliani.
Galliani concluded that Milan expect to sort out the future of Robinho next week, with several Brazilian clubs and MLS side Orlando City keen on signing the former Real Madrid and Manchester City playmaker.
"There are some offers and more will arrive on Monday," continued Galliani. "We are convinced that we can find a solution."