The pain was visible on Trent Williams’ face in the postgame locker room last Sunday. Williams concedes now that he was fearing the worst with his knee injury.

That night, trainers warned coaches, too, that they could be looking at a Grade 3 knee injury, the time of damage that could’ve shut down Williams for the year. An MRI the next morning revealed only a Grade 1.

“I think Grade 3 you actually have a tear. Grade 1, your ligament just got stretched real bad,” Williams said.

Williams was limited in practice both Wednesday and Thursday but thinks he’ll be okay to play Sunday at Seattle.

“It’s painful,” Williams said Thursday, “but it’ll be fine.”

Williams has already missed two games this year, and the Redskins will certainly need him Sunday. Seattle’s top pass rusher, Chris Clemons, had three sacks and forced two fumbles last week against St. Louis. He already has eight sacks on the year.

It seems every week Williams has a big challenge on his hands. Last Sunday, it was DeMarcus Ware, who had one sack and now has a league-leading 14 on the year.

“I think I did fine,” Williams said.