Bayern Munich’s Sadio Mane punched teammate Leroy Sane in the face after the team’s defeat to Manchester City.
Mane, who used to play for Liverpool, and ex-Man City star Sane, were seen arguing on the pitch near the end of Tuesday’s Champions League match.
Sky Germany said Sane’s lip was left bleeding and the pair had to be separated by the other players in the dressing room.
Mane was picked up separately when the team landed back in Munich while Sane took the team bus.
Bayern Munich have declined to comment.
Mane moved to the German team last summer on a three-year deal after being a fan favourite during a stellar career with Liverpool.
Sane was with City for four years before joining Bayern in 2020.
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But their side was on the wrong end of a 3-0 scoreline at the Etihad Stadium, despite being many people’s pick to win this season’s competition.
The defeat came under new Bayern boss – and former Chelsea manager – Thomas Tuchel.
For Pep Guardiola’s team it was an impressive performance, with goals from Rodri, Bernardo Silva and the prolific Erling Haaland giving them a commanding lead for the second leg.
The trophy is the only major honour to elude the Spanish manager in his tenure with the Blues.