After World War II he stayed in what would become East Germany and finished his playing days with Wismut Cainsdorf in 1950.

Fritzsch's playing career ended due to a back injury, he became a coach with Wismut Aue in 1950.

Fritzsch joined Dynamo Dresden as a coach on 30 June 1969 and the club soon began the most successful period of its history.

During his career the small, strict trainer also coached 40 national team players and helped uncover talents such as Ulf Kirsten and Matthias Sammer.

Fritzsch was succeeded as trainer at Dynamo by Gerhard Prautzsch and moved on to work for the DFV (Deutscher Fußball Verband der DDR or German Football Association of East Germany).