Injury update

Vikings S Tank Williams and DE Kenechi Udeze were not on the field during the early portion of practice, when the media are allowed to watch.

Williams suffered a knee injury against the New York Giants. Udeze did not participate because of personal reasons.

But, on a brighter note, RB Adrian Peterson was participating in drills, along with CB Antoine Winfield.

Peterson and Winfield were both limited. But their presence on the practice field is an encouraging sign that both could play Sunday against the Detroit Lions.

Others who were limited: FB Tony Richardson (knee), C Matt Birk (knee), LB Dontarrious Thomas (groin) and WR Troy Williamson (concussion).