AC Milan on Monday sacked head coach Massimiliano Allegri, just a year after bringing him in for a second stint in charge of the seven-time European champions, as part of a major overhaul following their failure to qualify for next season's Champions League.     Also sacked were CEO Giorgio Furlani, Sporting Director Igli Tare, and Technical Director Geoffrey Moncada.     The Rossoneri said in a statement: "It's time for change and a profound reorganization of the Club's sporting department.