Washington Commanders' Chase Roullier to have right knee surgery, likely season-ending, source says

Washington Commanders center Chase Roullier will undergo surgery on his right knee Thursday, a source told ESPN's Jeremy Fowler.

Roullier, who was placed on injured reserve on Sept. 20, waited for the swelling in his knee to subside before getting a second opinion. However, the belief all along was that he'd eventually need surgery. One source said Roullier would not return this season.

Roullier tore his MCL in a 36-27 loss to Detroit on Sept. 18. His loss is a bad one for Washington, which is now on its third starting center after backup Wes Schweitzer suffered a concussion a week later. Nick Martin, signed on Sept. 20, will make his second consecutive start when Washington (1-3) hosts Tennessee (2-2) Sunday.

The Commanders' line also could be minus right tackle Sam Cosmi, who underwent surgery on his right thumb Tuesday. It's uncertain whether he'll miss any games. If Cosmi can't play, Cornelius Lucas would start.

Washington made a change at right guard during a 25-10 loss at Dallas on Sunday, inserting Saahdiq Charles for Trai Turner. The latter missed most of training camp with a quad injury and did not play well.

The offense also could be minus rookie receiver Jahan Dotson, who injured his hamstring Sunday and could miss a week or two, according to coach Ron Rivera.