AC Milan news: Bonaventura’s surgery; when he will be back 26 nov 2018 According to reports from Sky Italia, AC Milan's Giacomo Bonaventura will undergo the scheduled surgery in his left knee tomorrow in Pittsburgh. With that said, the recovery period will be a long one, as the midfielder is expected to be back in time for the 2019/20 pre-season. For more news, visit our homepage.