Balotelli's arrival in Milan had been delayed by fog but he is expected to sign a four-and-a-half year deal with the seven-time European champions.
Milan are currently fifth in Serie A, trailing league leaders Juventus by 12 points.
Robinho: "Balotelli is a great player and will definitely help the squad. We are happy he has arrived and we are all going to welcome him. Let's hope he does well for Milan.
"There's enthusiasm in the changing room and we're getting better. There are still plenty of games to go and every three points will help us move up the table.
"The beginning of the campaign wasn't good, and once more the Italian league is proving to be difficult.
"But at the moment we're experiencing a good run of form in this crucial point of the season, and with 16 games to go anything is possible."