Rafa Benitez is to hold showdown talks with Sulley Muntari after he refused to sit in the stands on Sunday.
Upon hearing that he had not made the matchday squad for Inter Milan's crunch clash with Juventus, the Ghana midfielder opted to head home rather than stay on for the game.
He is likely to be punished for his act of petulance, with a heavy fine expected to be heading his way.
Inter boss Benitez understands Muntari's frustration, as everyone wants to play, but the Spanish coach wants his players to buy into the team ethic he is attempting to build at Giuseppe Meazza.
"No-one in a team is happy to sit on the bench, except the coach who has to do it for his job," said Benitez.
"But in the ground and on the bench we have to be united.
"This was his turn to miss out and he has to accept that. This is something that I will need to talk to him about."
Various reports over the summer linked Muntari with a move away from Inter and his actions over the weekend are only likely to fuel speculation that he could soon be on his way out of the club.