 Complete the following phrase:  He returned to Milan in 1990, where he was a reserve in the first teams defence, behind the legendary Maldini, Baresi, Costacurta, Tassotti back-line, which is regarded by many as the sport as one of the greatest defensive line-ups of all time. He made his Milan debut on 5 September 1990, in a 10 home Coppa Italia victory over Triestina, as Milan went on to reach the final of the tournament. He made his Serie A debut with the club on 3 March 1991, in a 41 home win over Napoli. In his four non-consecutive seasons with Milan 