Jacob “Stitch” Duran, the premier cutman in MMA, appears on MMAjunkie.com Radio and said that Charles Oliveira was injured just minutes before facing Cub Swanson this past weekend at UFC 152.

“I do know that in preparation for going out there, warming up, he twisted his knee,” Duran said.

Oliveira lost via first round stoppage to Swanson. His management has not said anything official, but Oliveira’s name did appear on the medical suspension list. No reason was given.