The pair played together at Manchester City prior to de Jong's departure in the summer and the Holland international says the Italian striker, who is being continually linked with the Rossoneri, would be a great inclusion at the San Siro.
"I have read about Mario coming to Milan in the papers," De Jong told the Italian media regarding the former Inter Milan youngster.
"Let's see what happens. It is always nice to have great players in the team.
"You don't have to be crazy, and he isn't, to be a great player. Balo is great but he must feel good to do his best."