Judging from the approach Vikings interim coach Leslie Frazier took in discussing Adrian Peterson's sprained right ankle during his news conference Monday, it sounds as if we might be in for a week of "will he or won't he play," Sunday against the Buffalo Bills.

Frazier confirmed he has been told Peterson suffered a sprained ankle in the second quarter in Sunday's victory at Washington -- that was the assumption once Peterson left the game and did not return but Frazier said immediately afterward he had not been given a diagnosis -- but added that the MRI was not complete.

"We are still going through the process and just trying to determine the severity of it," Frazier said of Peterson's injury. "We'll probably learn a little bit more, probably on Wednesday when we come back and just see what he can or can't do."

Frazier does not know if Peterson actually has a high ankle sprain, which would be considered worse than a standard sprain. One issue for Frazier will be Peterson's likely attempt to play Sunday, even if that might not be in his best interest.

"We had a little bit of that yesterday," Frazier said. "He wanted to get back in the game. He's coming up to me. Of course, I don't know, I'm keeping up with what's happening on the field and what's going on there. I just got our trainer to fill me in on where he was. They just said, 'Nope, let's hold him.' That's what I'll do again. I'll defer to our trainers, they'll tell me when he's ready to go."Edwards, Hutchinson hurting

Frazier said that Pro Bowl left guard Steve Hutchinson suffered a sprained thumb and defensive end Ray Edwards has a right ankle sprain that is "similar to Adrian's."

Hutchinson also is having an MRI to determine the extent of his injury. Frazier said he thought Hutchinson was injured in the second quarter but he continued to play after having his thumb taped. "I just saw him a moment ago," Frazier said during his news conference. "I just shook my head, because I know he was in pain, but he continued to play, and for an offensive lineman who's using his hands all the time, that's not an easy task."

Meanwhile, cornerback Chris Cook did not play Sunday because he has experienced swelling in both his knees. Cook had arthroscopic surgery on both knees at different points this season because of tears in his meniscus. Cook had been benched the previous Sunday against Green Bay but Frazier made it clear Cook wasn't sat for performance reasons. "That knee was acting up a little bit," Frazier said. "On Friday, he really wasn't pushing off the way we needed him to. I just thought it wouldn't be wise to try to get him on the field and go out and perform. We were counting on him up until that point." Etc. -- Frazier said he got a chance to speak to Tony Dungy and Brad Childress after Sunday's victory.