Atalanta winger, Ademola Lookman, clashed with his manager Ivan Juric during their Champions League win against Marseille on Wednesday night.
Lazar Samardzic scored the only goal as the Serie A won the game 1-0.
Before then, Lookman was taken off in the 75th minute of the match.
As the 28-year-old left the pitch, he could be seen exchanging words and Juric, seemingly annoyed to be substituted.
Juric then furiously grabbed Lookman, before CEO Luca Percassi and team-mate Marten de Roon on the bench intervened.
At the time Lookman was taken off, it was still goalless in the game.
After the game, Juric went over to the Nigerian and they exchanged words again.
According to Gazzetta dello Sport, it is not known whether that was to smooth things over or continue the dispute.