Anthony Pettis not only scored the biggest win of his life last night at UFC 164, by winning the lightweight championship, but the dynamic fighter did so via first round, submission. How many people called that? Although former champ Benson Henderson relayed that the fight ending armbar injured his arm following the bout, it was also revealed afterwards that Pettis didn’t emerge unscathed either .

Dana White reported at the post fight presser that Pettis felt his knee pop, and then the newly crowned champ had this to say about the injury (quotes via MMA

“I’m not sure yet,” Pettis said. “Henderson threw a kick and I went to check with my left leg, and he hit right in the crook of the knee, so I felt it go back and forth.”

“So I don’t know what happened. I stepped on it, and it was hurting a little bit, so when he had me on the cage, it was starting to lock up a bit. I’m not sure what happened. We’ll find out pretty soon.”

Pettis injured his right knee not long ago, of course, which forced him to withdraw from an August 3rd bout with featherweight champ Jose Aldo. “Showtime” reported, however, that he did not injure the same knee.

So, while Pettis made it clear he’s hoping to throw down with Aldo next (which would be awesome), it looks like we’ll have to wait and see how serious this injury is. The lightweight champ said he’ll undergo a MRI soon, which will provide more info as to how long he’ll be on the sidelines.

Stay tuned to Caged for more on this story and all your UFC news.