Replays showed Drummond throwing the ball off the back of Bulls center Daniel Gafford's head. Gafford also received a technical foul from the exchange, and Drummond was tossed after a review with 10:42 remaining in the third quarter.
The Pistons were down 63-52 at the time. Drummond finished the game with nine points and four rebounds -- his first time all season being held to fewer than nine rebounds. It was his fewest rebounds since he had three on Jan. 18, 2019, against Miami. He left that game because of an injury.
The Bulls held off the Pistons 108-99on Saturday to snap a six-game losing streak.
The Associated Press contributed to this report.
Drummond ejected after throwing ball at Gafford
Daniel Gafford and Andre Drummond both receive technical fouls after Gafford talks smack in Drummond's face and Drummond throws the ball at him. Drummond would then be ejected from the game.