Sean Strickland’s second reign as UFC middleweight champion may be put on hold after the fighter revealed a series of serious shoulder injuries sustained during his title win at UFC 328. In a social media post on Wednesday, Strickland disclosed he is dealing with a type 2 AC separation, an extended type V SLAP tear, and a partial rotator cuff tear—injuries that could keep him out of the Octagon for an extended period.

“Gonna have to walk this one off,” Strickland wrote, sharing the diagnosis with fans. According to the Cleveland Shoulder Institute, recovery from surgery for a SLAP tear alone typically takes six to 12 months for athletes, casting doubt on when the champion will be able to defend his belt.

Strickland’s victory over Khamzat Chimaev at UFC 328 marked his second stunning upset to claim the middleweight title. He first captured the championship by defeating Israel Adesanya at UFC 293 as a massive +540 underdog, then followed it up by beating Chimaev as a +375 underdog this past Saturday. The win was especially impressive given Chimaev’s dominant reputation, but the physical toll has been severe.

With the always-controversial champion likely sidelined, the UFC faces a tough decision on whether to book an interim title fight. Chimaev has already expressed interest in a rematch, though rumors suggest he may be eyeing a move to light heavyweight. Meanwhile, top contender Nassourdine Imavov has been patiently waiting for his shot at the 185-pound crown, with his only loss in five years coming to Strickland in a light heavyweight bout. For now, the middleweight division hangs in the balance as Strickland focuses on recovery.