Bennacer has joined Marseille until the end of the season, with an option to buy.
Marseille pays an initial loan costs of € 1 million, with a permanent option worth € 12 million plus € 3 million in bonuses.
Bennacer won the Scudetto and the Supercoppa Italiana with Milan, signed in 2019.
He made 178 performances for the Rossoneri, scored eight goals and made 12 assists.