Bayern Munich midfielder Joshua Kimmich is said to have been involved in a heated exchange with a coach.
The German midfielder was seemingly held back from a tunnel spat with head coach Thomas Tuchel's assistant.
Bayern lost again in the Bundesliga, this time to Bochum by a 3-2 scoreline to go eight points behind Bayer Leverkusen in the league.
According to Bild, Bayern midfielder Kimmich had an argument with Tuchel's assistant coach Zsolt Low, who was with Tuchel at Chelsea.
I know what was going on. This is not for the public," Tuchel told reporters post-game.
We are in a football locker room. This is a pretty normal occurrence if kept within limits. And it stayed within limits."
