Chelsea boss Mauricio Pochettino says he was "so upset" about the dispute over who would take the penalty in their 6-0 win over Everton and has warned his players not to do it again.
Nicolas Jackson and Noni Madueke argued over who would take a spot-kick, which Cole Palmer went on to score for his fourth goal.
"I can't accept this kind of behaviour," said Pochettino.
"I told them it's the last time I want to see this kind of behaviour."
He added: "It is impossible to have this type of behaviour after this performance.