A back injury to Baylor quarterback Jarrett Stidham may be more serious than initially believed.

On Monday, coach Art Briles told reporters that Stidham's ailing back contained no structural damage and that the pivot's status was not in jeopardy heading into Saturday's affair against Oklahoma State. On Wednesday, that tune changed.

"Honestly, not as far along as what I'd like for him to be," Briles said of his quarterback, according to Chuck Carlton of the Dallas Morning News. "We'll see in the next day or two."

Baylor is already down to its second-string quarterback, after Seth Russell sustained a season-ending neck injury on Oct. 24. After falling to Oklahoma last week, the No. 10 Bears' College Football Playoff hopes are hanging by a thread.