Williams injured his knee when attempting to plant his foot to make a block. It buckled in the turf, leaving him in serious pain.
He was tended to by trainers and helped off the field. After being looked at on the trainers table, he has started to test it out by walking around on the sideline, which is obviously a good sign.
In the meantime, he will be replaced by Jordan Black. who is making his first appearance in a game since playing for the Jacksonville Jaguars on Jan. 2, 2011.
Stay in this storystream for all your NFL info today. For all the latest news and analysis on the Washington Redskins, head over to Hogs Haven. For more on the Cincinnati Bengals, check out Cincy Jungle.
This story was originally published on SBNation.com.