Jerome Boateng slapped team-mate Leon Goretzka during Bayern Munich training on Wednesday as the pair were engaged in a furious bust-up.
The 2014 World Cup winner became incensed after Goretzka mistimed a challenge during a small-sided game, which led to Boateng swinging out at his team-mate.
According to German publication BILD, Goretzka was originally angry after arguing with Thomas Muller over a penalty decision – with the former dismissively gesturing back to the veteran.
