 Hermann played with Víkingur R. until he was 10 years old, when he switched to Valur.One summer he scored 62 goals in 15 games for their youth team.Hermann started his senior career in 1963 with Valur, where he played until 1968, when he moved to Austria to play as a professional with SC Eisenstadt, the third Icelander to play as a professional footballer, after Albert Guðmundsson and Þórólfur Beck.