The Bayern Munich duo of Sadio Mane and Leroy Sane came to blows following their 3-0 defeat to Manchester City in the Champions League.
The two players had to be separated in the dressing room after the quarter-final first leg at the Etihad.
Sky Germany reports that Sane’s lip was bleeding after the altercation.
The duo were seen on the pitch exchanging words during the latter stages of the match on Tuesday night.
After their flight landed in Munich, Mane was picked up privately from the airport while Sane took the team bus.
Bayern Munich has refused to comment on the incident.