Briaschi moved to Juventus during the 1984–85 season, joining his former Vicenza team-mate Rossi, where they attacking duo were supported by Michel Platini in the playmaking role. Briashi scored 12 goals during his first season with the club, and won the UEFA Super Cup in 1984, and was part of Juventus' European Cup victory in 1985, scoring goals against Grasshopper, Sparta Prague, and Bordeaux, in the semi-final, where he also sustained an injury. The following season, he found less space, although he was able to win the 1985–86 Serie A title with the club, also winning the 1985 Intercontinental Cup. His chances were even more limited during his third season in Turin, and he eventually returned to Genoa in 1987.