Luka Jovic has returned to Eintracht Frankfurt on a six-month loan deal from Real Madrid, the clubs have announced.
"We will not start chasing our players and ask them whether their wives are barbers," a Union Berlin spokesperson said.
Moussa Diaby scored twice as 10-man Bayer Leverkusen came from a goal down to defeat in-form Eintracht Frankfurt 4-1 in the DFB Pokal second round.
The German Hairdresser Association has asked the German Football Association (DFB) why footballers have taken to the pitch with fresh haircuts.
Bayer Leverkusen missed the chance to go top of the Bundesliga when Eintracht Frankfurt came back from a goal down to win 2-1 thanks to an Amin Youn
Borussia Monchengladbach's Lars Stindl scored a hat-trick, including two last-gasp goals, as they rescued a 3-3 draw with Eintracht Frankfurt.
Wolfsburg broke into the Bundesliga top four after Wout Weghorst scored a second-half brace to inspire a 2-1 win over Eintracht Frankfurt.
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