FILE - In this file photo, Minnesota Vikings running back Adrian Peterson (28) moves the ball during the first half of an NFL football game against the Green Bay Packers in Green Bay, Wis. Peterson has won The Associated Press 2012 NFL Offensive Player of the Year award just one year after major knee surgery. (AP Photo/Morry Gash, File)
FILE - In this file photo, Minnesota Vikings running back Adrian Peterson (28) moves the ball during the first half of an NFL football game against the Green Bay Packers in Green Bay, Wis. Peterson has won The Associated Press 2012 NFL Offensive Player of the Year award just one year after major knee surgery. (AP Photo/Morry Gash, File)
