The Boston Celtics star was ruled out for the rest of the playoffs with a torn right Achilles tendon, the team announced. Tatum underwent surgery on Tuesday, less than 24 hours after he initially sustained the injury. A timeline for his return is not yet known, but he is expected to make a full recovery.

The Celtics are in a 3-1 series hole after dropping Game 4 on Monday in Madison Square Garden, shellshocked not only by the loss of Tatum but by the reality of facing elimination when the plan was to repeat as champions.

Jayson Tatum gets shaken up after a foul by Josh Hart causes the Celtics star to fall hard on his hand vs. the Knicks.

Jayson Tatum’s potentially serious lower left leg injury cast a pall over the second round. Tatum collapsed to the ground in the fourth quarter of the Celtics’ Game 4 loss to the New York Knicks and had to be carried off the court after he was writhing in pain and grabbing at the back of his ankle.