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 108-99 on Saturday to snap a six-game losing streak.
The Associated Press contributed to this report.