"We will not start chasing our players and ask them whether their wives are barbers," a Union Berlin spokesperson said.
The German Hairdresser Association has asked the German Football Association (DFB) why footballers have taken to the pitch with fresh haircuts.
Striker Krzysztof Piatek scored twice in three minutes as Hertha Berlin came from a goal down to beat 10-man Union Berlin 3-1 in the capital's Bunde
Hertha Berlin and Union Berlin have only ever played twice in the Bundesliga, but the rivalry is deeply rooted in the history and makeup of Berlin.
Bayer Leverkusen ended their five-game winning run in the Bundesliga with an uninspiring 0-0 draw against visitors Hertha Berlin on Sunday.
Erling Haaland scored four goals in a sensational second-half performance to help Borussia Dortmund come from a goal down to crush Hertha Berlin.
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