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Breitner began his professional career with Bayern Munich, a German football club based in Munich, Bavaria. He joined the club's youth academy in 1964 and made his senior team debut in 1970. During his time at Bayern, Breitner won four Bundesliga titles, three European Cups, and one Intercontinental Cup. He also played for Real Madrid, Eintracht Braunschweig, and Werder Bremen before retiring in 1983.