The fourth overall pick in this year's draft said he'll have an MRI exam after feeling pain in his left knee and a toe after another player fell on him with about 1½ minutes left in the fourth quarter of Washington's 30-27 overtime loss to the Houston Texans.
Williams was helped off the field and did not return to the game.
"Somebody landed it on it wrong," Williams said.
He said he was given an initial test on his left ACL, and he passed. But otherwise, Williams wasn't sure when he might know the extent of his injury.
"It's my first time dealing with something like this," he said.
Williams said after the game his leg felt sore.
"I just want to get back out there on the field. I just hate having to sit that last drive out and watch my team playing overtime without me," he said.
Copyright 2010 by The Associated Press