Webster's injury is 2nd degree MCL sprain

Broncos coach Mike Shanahan said Nate Webster's injury was a second-degree sprain in the MCL of his left knee.
Webster thought it was the "same thing D.J. [Williams] got," and he will have an MRI Friday. The Broncos have lost all three starting linebackers in successive weeks and will likely be starting Jamie Winborn, Wesley Woodyard, and Niko Koutouvides for the next couple of games.

(rotoworld.com)