 Complete the following phrase:  However, Cha transferred to Bayer Leverkusen due to a ficial difficulty of Frankfurt in 1983. In the 198586 Bundesliga, he scored 17 goals, his most goals in a single Bundesliga season, and Leverkusen qualified for the UEFA Cup for the first time by finishing sixth. The magazine kicker once again selected him for the Team of the Season. In the 