Charles Barkley knows who Jayson Tatum's first call should be when it comes to rehabbing a ruptured Achilles tendon.

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.

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