"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.
Visitors VfB Stuttgart cruised past 10-man Augsburg 4-1 on Sunday to secure a first win in four Bundesliga matches and climb to 10th place.
Schalke came from a goal down to lead against Augsburg but conceded a stoppage-time equaliser on Sunday to extend their winless run to 27 matches.
Florian Grillitsch scored twice as Hoffenheim beat visiting Augsburg 3-1 in the Bundesliga on Monday to earn their first league win since September.
Underdogs Augsburg could go top in Germany on Saturday. ESPN's lead Bundesliga commentator Derek Rae explores a club that keeps defying gravity.
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