Aron Baynes will be out of action for a while.
The big man played in the Boston Celtics' latest home game against the Phoenix Suns, and left the game early, minutes after a dunk.
The Suns eventually won this game behind a strong effort from Deandre Ayton (23 points, 18 rebounds), ending the night 111-103.
The Athletic's Shams Charania later tweeted that Baynes had suffered a broken left hand, and will be undergoing surgery. He was also expected to return in a month, according to Charania's sources.
Baynes did not speak to media post-game, but was "disappointed", according to Celtics head coach Brad Stevens.
"I don't know any updates on timelines or anything like that," Celtics coach Brad Stevens said. "But, probably, clearly, he's going to be out for some time."
The Celtics' front court depth takes an additional hit with Baynes' injury, which is already suffering from Al Horford's knee tendinitis, but opens up more playing minutes for reserves Daniel Theis and Rob Williams.