Bild reported that Sadio Mané attacked Leroy Sané in the Bayern Munich locker room after the 3-0 defeat by Manchester City.
According to this German newspaper, the Senegalese forward was dissatisfied with the way his teammate spoke to him while still on the field of play and ended up hitting him with a punch.
Still according to Bild, Sané and Mané even had to be separated by teammates.