The NBA announced Saturday that Bucks forward Thanasis Antetokounmpo has been suspended for one game for headbutting Celtics forward Blake Griffin in a game on Thursday night. He will serve the suspension in the Bucks’ game against the 76ers on Sunday.

Late in Boston’s win over Milwaukee, Griffin fouled Antetokounmpo hard on a fastbreak, and Antetokounmpo reacted by headbutting Griffin after the whistle, resulting in a scrum. After the two teams were separated, Griffin received a flagrant foul while Antetokounmpo was ejected from the game.

By the time the interaction occurred, the game was essentially decided as the Celtics were up on the Bucks by more than 40 points with less than 90 seconds remaining.

Antetokounmpo, the brother of Bucks star Giannis Antetokounmpo, was drafted by the Knicks and is in his fourth season with Milwaukee, serving as one of the last members of the team’s bench. On the season, he has played in 33 games and is averaging 0.8 points and 0.9 rebounds in 4.2 minutes per game.