 Complete the following phrase:  In summer 1990, Mondonico left Atalanta for Torino and was replaced by Pierluigi Frosio. Under new management in the 199091 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 