According to German media, Bayern Munich forwards Sadio Mane and Leroy Sane had a violent incident in the locker room following their 3-0 Champions League loss to Manchester City.
According to Bild, Sky Germany, and several other media outlets, the two players argued after the game and had to be removed by their teammates.
According to Bild, former City winger Sane was smacked in the face by the Senegal international, resulting in a cut lip.
Bayern declined to comment on the incident on Wednesday.
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According to Bild, the brawl began after Bayern's loss to Manchester United on Tuesday, with the film showing the two bickering on the field.
Bayern's Champions League defeat was their worst since 2017.
The six-time European champions currently have little chance of overcoming the gap in the return leg in Munich on Wednesday and advancing to the semi-finals.