 Mussi spent two seasons with the club (1987–89), winning an Italian Serie A title and a Supercoppa Italiana in 1988, as well as one European Cup (the predecessor to the UEFA Champions League) in 1989 with the club.He subsequently moved to Serie B side Torino in 1989, helping the team to win the Serie B title that season, and to earn promotion to Serie A.The following season, he won the 1991 edition of the Mitropa Cup with Torino, and he helped his club to qualify for the UEFA Cup the next season by finishing the Serie A season in fifth place.