STILLWATER, Okla. -- Oklahoma coach Bob Stoops said Monday that a broken collarbone will keep star tailback Adrian Peterson out of this week's rivalry game at Oklahoma State.
It was the first time Stoops has ruled out Peterson, the 2004 Heisman runner-up, for the Bedlam game Saturday in Stillwater.
Doctors initially expected Peterson to be able to return six weeks after his collarbone snapped on a touchdown run against Iowa State on Oct. 14. This is the sixth week since the injury.
"We're not expecting him to play," Stoops said Monday on the Big 12 coaches' conference call. "His ... bone scan shows that there's still a little bit of healing that needs to be done. This won't change, I don't believe. We're not expecting him to play."
Peterson had averaged 155.8 rushing yards and scored 11 total touchdowns in his first six games for the No. 13 Sooners (9-2, 6-1 Big 12) this season. The best rushing performance of his career came in Stillwater in 2004, when he ran for 249 yards and had an 80-yard touchdown run in Oklahoma's 38-35 win.
He had 237 rushing yards, including scoring runs of 84 and 71 yards, against the Cowboys (6-5, 3-4) during a 42-14 Sooners win last season in Norman.
"Obviously he's a guy that can make a difference in a game no matter who he plays against, but our people have to adjust and prepare," Oklahoma State coach Mike Gundy said.
"Somebody's going to be back there playing tailback and I've been impressed with what the couple of guys they've had in there the past few weeks have done. I don't really think it affects a team's preparation because you don't really know whether he's going to play or not," Gundy said.
Brown, a freshman, ran for 169 yards Saturday against Baylor in his first career start.
"They're a quality team and whenever a quality player is injured, they have someone to back him up," Oklahoma State linebacker Jeremy Nethon said. "I think they've done a done a good job of running the ball in his absence and you can't take any advantage just because Adrian Peterson is out. They're still a high-quality team."
"They don't have a shortage of talent running the ball," safety Donovan Woods added.
Despite Peterson's success running the ball against the Cowboys, several Oklahoma State players were disappointed that he wouldn't be in the game this time.
"To me, I always want to play against the best. That shows the caliber of player that you are," Cowboys linebacker Rodrick Johnson said. "I'll line up to play against anybody that they put on the football field. They could put an offensive guard at tailback and I'd still try to hit him. It really doesn't matter to me."