Wuppertal immediately earned promotion to the Bundesliga, and finished a surprising third in their first season in the top-flight.
After Wuppertal's failure to bounce back in their first season, Müller left, moving south to in 1976 to join 1.
In his second season at Nürnberg, they won promotion, beating Rot-Weiss Essen in a playoff, only to be relegated the following year.
He did, though, manage a few decent runs in the first team, including an appearance in the 1982 European Cup Final, but eventually lost his place to the incoming Jean-Marie Pfaff, before retiring in 1984.
FC Nürnberg as general manager, and made a surprise return to action in November 1986, starting a Bundesliga fixture because of an injury to Andreas Köpke.