Vikings running back Adrian Peterson returned to practice Tuesday for the first time since tearing his anterior cruciate ligament on Christmas Eve at Washington.
Peterson will be protected from contact and the Vikings haven't yet made a determination about his eligibility for preseason games. He has officially been ruled out for Friday's game against the Bills.
Peterson was activated from the physically unable to perform list Sunday. He and coach Leslie Frazier remain focused on a goal of Peterson playing Sept. 9.