Avery Bradley suffered a severely strained right hamstring in the fourth quarter of the Boston Celtics' Game 1 loss to the Atlanta Hawks.
Although he expressed a desire to return for Tuesday's Game 2, Bradley said he will undergo further testing Sunday to determine the full extent of the injury.
Brad Stevens said Bradley heard a pop after landing awkwardly while defending a layup attempt by Jeff Teague.
Bradley was tended to by Boston's medical staff on the floor. Then he needed to be helped off the court.
"I saw Avery. He's very, very sore, and he said on the court that he heard a pop," Stevens said. "I don't know if that is something -- if he got hit or what. So we'll see. I think that he will be treated and everything else. We'll see."
"I don't really want to talk about [the injury] that much. I just want to try to get treatment and take it day by day and hope that I can be back for the next game," said Bradley, who expected to undergo an MRI on Sunday morning. "I'll get treatment tonight -- probably get treatment all night. My main focus is just trying to get back for the next game."