 FC Köln, the club he joined after he did not get enough games at Bayern.Injury worries of his new club made him appear as defender and doing well on that adopted position prevented him from giving up his new role.After being just part of the squad of FC Bayern Munich that won the Bundesliga in 1973 and 1974, and the European Cup in 1974, Zimmermann was a vital figure for Köln in Köln's DFB-Pokal wins in 1977 and 1983.