The Oklahoma City Thunder announced Monday that forward/center Chet Holmgren will miss at least eight weeks with a pelvic fracture.

Holmgren sustained a right iliac wing fracture during the first quarter of Sunday night’s game against the Golden State Warriors. The team says it expects him to return this season, and an update will be provided in eight to 10 weeks.

It’s a big loss for a team that started the season with seven straight wins and currently is tied for the Western Conference lead with an 8-2 record. Holmgren was runner-up for Rookie of the Year last season and has been one of the league’s most efficient players this season. He is averaging 18.2 points, 9.2 rebounds and 2.9 blocks per game.

Holmgren contested a layup by Andrew Wiggins, collided with him and hit the floor hard.

He immediately reached for his right hip and stayed down for a while before he was helped off the court. He did not put pressure on his right leg, but he gave a thumbs up as he hobbled off.

The Thunder led 16-12 when Holmgren was taken out and eventually fell behind by 30 late in the third quarter. Oklahoma City made it a game before losing 127-116.

Thunder guard Shai Gilgeous-Alexander said it was difficult to refocus after the injury.

“It’s hard,” he said. “Hopefully, he’s OK. It’s part of the game, but it sucks.”

The 7-foot-1 Holmgren is one of the league’s top shot blockers, and he is agile enough to defend guards when he has to switch.

“It changed a lot for us defensively, for sure,” Gilgeous-Alexander said. “You guys can probably tell, he does so much on that end of the floor.”