FILE - In this Nov. 20, 2011, file photo, Minnesota Vikings running back Adrian Peterson is carted off the field after getting injured during the first half of an NFL football game against the Oakland Raiders in Minneapolis. Peterson is still recovering from a sprained left ankle and has missed the last two games. But last Sunday, the Vikings gained a season-high 498 yards and 27 first downs without him. (AP Photo/Andy King, File)

Photo by: Bill Feig

FILE - In this Nov. 20, 2011, file photo, Minnesota Vikings running back Adrian Peterson is carted off the field after getting injured during the first half of an NFL football game against the Oakland Raiders in Minneapolis. Peterson is still recovering from a sprained left ankle and has missed the last two games. But last Sunday, the Vikings gained a season-high 498 yards and 27 first downs without him. (AP Photo/Andy King, File)