Although he was a member of the squad during the 1972–73 season, Rossi made his debut in professional Italian football with Juventus in 1973, making an appearance in the Coppa Italia and winning a runners-up medal in the 1973 Intercontinental Cup. He was often injury-prone during his first few seasons, only making three Coppa Italia appearances with Juventus between 1972 and 1975, and scoring no goals. After three operations on his knees, he was later sent to gain experience with Como, where he made his Serie A debut during the 1975–76 season, initially playing as a right winger, where his small build would not be a hindrance; he made six Serie A appearances for the club, but again failed to score.