Tatum suffered what appeared to be a serious lower leg injury late in the fourth quarter. He writhed in pain on the court, had to be carried off by Celtics staffers and was seen on ESPN’s broadcast riding in a wheelchair after exiting down the tunnel.

The Celtics blew a 14-point lead, then lost their best player to injury in a Game 4 loss to the Knicks that pushed Boston to the brink of elimination.

Boston Celtics assistant coach Amile Jefferson stepped through a door in the team’s locker room late Monday night and walked toward Jayson Tatum’s mother, Brandy Cole-Barnes. Jefferson, one of Tatum’s closest friends dating back to their time as Duke teammates,