In summer 1990, Mondonico left Atalanta for Torino and was replaced by Pierluigi Frosio. Under new management in the 1990–91 season, Atalanta reached the quarter-finals of the UEFA cup, overcoming Croatian club Dinamo Zagreb, Turkish club Fenerbahçe, and German club 1. FC Köln in the first three rounds. Despite reaching the quarter-finals, the club replaced Frosio with Bruno Giorgi midway through the season, after a poor run of form left the club in fourth-to-last place in Serie A in January. After this change, the club would be eliminated from the UEFA cup by domestic rival Inter (2–0 on aggregate), who would eventually win the tournament. In Serie A, Atalanta recovered some ground to achieve a mid-table finish in Serie A, though did not qualify for UEFA competitions. Percassi also worked to further develop the club's youth sector. In 1991, he appointed Fermo (Mino) Favini as a scout; he would recruit many promising players to the club, and the club won its first national youth championship in 1993.