Oklahoma receiver Kenny Stills caught a short pass, made a cut and went down suddenly.
He walked off the field on his own power after being tended to by trainers, but he'll have his right knee looked at more closely while he takes a seat.
The Sooners have looked sluggish in this one, but lead 27-17 midway through the third quarter.
We'll keep an eye on Stills' status, but his reaction leaving the field is surely a good sign. Don't be surprised if he tries to return.
Elsewhere, Kansas center Jeremiah Hatch, who was injured earlier, was taken to the hospital but is reportedly "doing well," according to an announcement by Kansas. There's been no definitive word on what injury he suffered.