OKLAHOMA CITY — The Oklahoma City Thunder announced Monday that forward/center Chet Holmgren will miss at least eight weeks in the NBA 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.

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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.

READ: NBA: Thunder’s Chet Holmgren suffers hip injury vs Warriors

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.

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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.”

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Oklahoma City entered Sunday night leading the league in defensive rating but didn’t look like it in the second and third quarters without the team’s anchor in the paint. 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. He cleans up so many things, deters so many things around the rim when he’s not blocking them (shots).”

Still, the Thunder started the fourth quarter strong, and Oklahoma City trimmed its deficit to six in the closing minutes.

Gilgeous-Alexander said there was a lesson to be learned from the second half.

“Especially against good teams, you can’t go down that big,” he said. “It’s almost impossible to come back. You’ve got to be better on both ends of the ball for longer periods of time.”

The Thunder, one of the deepest teams in the league, are suddenly thin in their frontcourt. Holmgren had moved from forward to center because newly-acquired big man Isaiah Hartenstein was out with a fractured left hand. The Thunder were also missing forward/center Jaylin Williams (right hamstring) and guard/forward Kenrich Williams (right knee).

Oklahoma City hosts the Los Angeles Clippers on Monday.