The Boston Celtics may have suffered a serious blow on Monday night. The star forward left the game against the Sacramento Kings after landing on Kings center Domantas Sabonis’ foot. He’s doubtful to return due to an ankle sprain,

Tatum was leading the Celtics in scoring when he got hurt. The six-time All-Star made a contested 3-pointer and was fouled by Kings 6-foot-11 center Domantas Sabonis, who was called for a Flagrant 1 foul. Tatum’s right foot landed on Sabonis’ foot and the veteran forward immediately dropped to the floor.

With Boston all but locked into the No. 2 seed in the Eastern Conference playoffs, the team could err on the side of caution in the coming days.