Isaiah Thomas sprained his ankle in the fourth quarter of Game 5 against the Atlanta Hawks and did not return. It has been described as a "mild" sprain.

He left the game with 10:14 remaining and the Celtics trailing 93-64. They ended up losing 110-83.

Game 6 will occur Thursday in Boston. The Hawks now lead the series 3-2.

Avery Bradley is "very unlikely" to play the rest of Boston's first-round series against the Atlanta Hawks after suffering a significant strained hamstring in Game 1.

"Avery has a pretty significant strained hamstring. I would say he would be doubtful for any of the remainder of the series, certainly very unlikely Tuesday night [for Game 2]," Brad Stevens said as the team practiced on the campus of Georgia Tech. "As of right now, I would say he's out Tuesday night, but obviously he'll continue to get treatment around the clock and go from there. But I would say very unlikely the rest of the series."

Bradley heard a pop after landing awkwardly while defending a layup attempt by Jeff Teague.

Bradley said he "felt weird" after landing and collapsed to the ground clutching his hamstring while trying to run back up the court.

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."

John Holland will sign a two-year deal with the Boston Celtics.

The second season of the deal is non-guaranteed for Holland. 

Holland averaged 16.0 points, 3.1 rebounds and 2.0 assists in 30.2 minutes per game this season for the Canton Charge of the D-League.