Jayson Tatum will have an MRI on the lower leg injury he suffered during the Boston Celtics’ 121-113 Game 4 defeat against the New York Knicks on Monday.

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.