Joel Embiid left the Philadelphia 76ers' 108-94 loss to the Cleveland Cavaliers in the first quarter with a sprained left shoulder.
Embiid will have an MRI on Thursday.
"I'm really sort of a prisoner to the medical people's information. I haven't checked in. I just left the team. I'm unsure, I really am unsure," said Brett Brown of Embiid's condition.
Embiid suffered the injury after colliding with Ante Zizic.
The Sixers are already without Ben Simmons for an unspecified amount of time.