Milan suspended training this afternoon after Zlatan Ibrahimovic got into an ugly fight with his teammate Oguchi Onyewu.
La Gazzetta dello Sport claims Ibrahimovic made a dangerous sliding tackle on the United States international defender, who reacted furiously.
Onyewu has only just returned from a serious knee injury, which kept him out of action for the entirety of last season.
Milan Coach Massimiliano Allegri suspended training after the two players couldn't be separated.
Around 30 fans witnessed the fight, prompting Allegri to take drastic action.
It remains to be seen whether the two players will be sanctioned for causing such a scene.
After all, it's not the first time Ibrahimovic has rubbed his teammates up the wrong way since joining Milan.
He was caught on camera directing a Taekwondo kick at Rodney Strasser for no apparent reason.