Fighters quite often say they are nowhere near 100-percent upon entering the Octagon.

Well, Anthony Pettis proved that theory correct yet again, as the new UFC lightweight champion revealed a serious injury hit him in the weeks leading up to his victory over Benson Henderson.

Pettis will return to action this December against Josh Thomson at UFC on FOX 9.

“I actually separated my shoulder two weeks before the fight,” said Pettis, during an appearance on The MMA Hour. “So, going into the fight, I had a separated right shoulder.”

Pettis secured the win with an armbar late in the first round. He said that the injury happening “sucks….but I wasn’t backing out of that one.”