In 1994, Mussi returned to Parma, where he enjoyed great success. In his second spell with the Emilian club, he won the UEFA Cup twice (in 1995 and 1999), and one Coppa Italia in 1999; he also reached the Coppa Italia final in 1995, and he managed a third-place finish in Serie A in 1995, a second-place league finish in 1997, and a fourth-place finish in 1999 with Parma. He retired from football in 1999, but he briefly returned to Massese, the club with which he had made his debut, during the 2010–11 season, in the lower divisions, although he failed to make an appearance for the club during the season. Overall, Mussi played 250 matches in Serie A throughout his career.