Williams out, Williamson doubtful

As expected, Vikings safety Tank Williams (knee) is out of Sunday's game against Detroit.

Wide receiver Troy Williamson (concussion) is listed as doubtful and not expected to play, although he hasn't been ruled out.

Cornerback Antoine Winfield (hamstring) is questionable and said he would test the leg in pregame warm-ups.

Linebacker Dontarrious Thomas (groin) also is questionable.

Running back Adrian Peterson (knee) is probable and will play after missing the last two games because of a torn lateral collateral ligament.