Mickael Pietrus fell awkwardly onto his back in the second quarter of Boston's 99-86 loss to the Sixers on Friday.
Pietrus remained motionless for several minutes and was removed from the court on a stretcher.
Pietrus was immediately taken to the hospital for tests with what was initially described as a “questionable closed head injury.’’
“He’s already had an X-ray [and] CT [scan]. He’s doing an MRI right now," Doc Rivers said after the game.
Pietrus was not hospitalized and returned to the team's hotel. He was cleared to travel on Saturday morning.