The growing list of injuries in East Lansing added another big name.

Top safety R.J. Williamson will be out indefinitely after having surgery for a torn bicep, MSU coach Mark Dantonio announced on Sunday. Williamson could possibly return to the team for a postseason bowl game.

Two weeks ago, Williamson earned the Football Writers Association of America’s Defensive Player of the Week award for his performance in the Spartans’ 35-21 win against Air Force. The senior had 24 tackles, two interceptions, a fumble recovery and a touchdown on the year playing in the Spartans’ depleted secondary.

It’s another crushing blow for the No. 3 team in the country, which has been decimated by one key injury after another during the regular season. They already lost starting cornerback Vayante Copeland for the season with a neck injury after the third game of the season.

Starting linebacker Ed Davis is already out for the season and preseason All-American offensive tackle Jack Conklin missed Saturday’s game with a leg injury. Conklin’s replacement, Dennis Finley, broke is fibula and tibia during the win against Purdue.

That doesn’t include the injuries to starting offensive lineman Kodi Kieler, tight Josiah Price and receiver Macgarrett Kings, all of whom were held out on Saturday.

Cornerbacks Demetrious Cox and Arjen Colquhoun will have to shoulder the load for a Michigan State secondary that’s 91st in the country in passing yards allowed.