The Youth Sector has been responsible for producing some of the club's greatest ever players, including their top three all-time appearance makers, Paolo Maldini, Franco Baresi and Alessandro Costacurta, as well as several players, in recent years, who have managed to become regular players in Serie A. The training facilities are based at the Centro Sportivo Vismara (Vismara Sports Centre), a 57 acres site in Gratosoglio, Milan, although the Primavera team train at Milanello alongside the first team.