Juventus coach Max Allegri was unhappy with his players after their 2-1 win over Sassuolo.
While Cristiano Ronaldo struck twice, the game's lowlight came from Douglas Costa being sent off for spitting.
"Maybe he was irritated at a foul before, but it doesn't matter, because this absolutely must not happen. The one thing we must avoid doing is falling for provocation," Allegri told Sky Sport Italia.
“We could've scored a third goal, but instead we started to play as individuals, we tried to dribble past everyone, this wound up the opposition, who then reacted badly and you get to situations like Douglas Costa.
“You just had to see the first three games and how close Ronaldo went to scoring. Again today, he was a little too hasty and eager to score, but it bounced off the post and right into his path. That unblocked him."