The Washington Redskins have placed offensive lineman Mike Williams and safety Reed Doughty on injured reserve, officially ruling them out for Sunday's season finale against the San Diego Chargers.

Also Wednesday, the team signed running back P.J. Hill and cornerback Marcus McCauley.

Williams tore a muscle in his foot in Sunday's loss to the Dallas Cowboys. Doughty sustained a high ankle sprain after making his first career interception in the game.

Hill was signed off the Philadelphia Eagles practice squad. McCauley has been with the New Orleans Saints, Tampa Bay Buccaneers, Detroit Lions and Minnesota Vikings in his three NFL seasons. He was cut last week by the Saints.

The Redskins now have 12 players on IR.