Vikings running back Adrian Peterson is sitting out a second consecutive day of practice as he continues to get treatment on his sprained right ankle.

Peterson plans to test the ankle on Friday and it's likely the Vikings will make a game-time decision on whether he plays Sunday against Buffalo at Mall of America Field.

Also missing from the field this afternoon were wide receivers Percy Harvin (illness) and Sidney Rice (hip). Rice, who has played in two games since coming off the physically unable to perform list, also was rested last Thursday as a precaution. Harvin was limited in Wednesday's practice and could be dealing with another episode of migraine headaches.

Cornerback Chris Cook, who has been dealing with swelling in both knees after having separate procedures done this season to repair meniscus tears, looked as if he will be a spectator today after being limited on Wednesday.

Also out again are left guard Steve Hutchinson (broken thumb) and wide receiver Greg Lewis (concussion).

The Vikings were without practice squad wide receiver Freddie Brown as well, meaning their receiving corps consisted of Hank Baskett, Greg Camarillo and Bernard Berrian. Quarterback Joe Webb, who was expected to be moved to wide receiver in the NFL, was helping out running routes in the portion of practice open to the media.

Brett Favre, who is listed with ankle, neck and right shoulder issues, returned today after getting Wednesday off.

Meanwhile, the Denver Post is reporting that Washington Redskins tight ends coach Jon Embree has been offered the head coaching job at Colorado. Vikings running backs coach Eric Bieniemy also interviewed for that position last weekend and was believed to have impressed. Both Embree and Bieniemy played football at Colorado.

Here is the story from Post. Colorado released a statement that no one has been offered the position.