For what it's worth, according to buffalobills.com (Chris Brown):
Head coach Dick Jauron confirmed that two of his linebackers have knee injuries coming out of the Cleveland game.
"Both Kawika (Mitchell) and Marcus (Buggs) are knees and we’ll know more obviously once they get checked either tonight or (Monday)," said Jauron.
As for Jonathan Scott, Jauron said he suffered an ankle injury.
Jauron also added that he was "not optimistic" about Buggs and Mitchell, which means the Bills are likely to be shopping for some reinforcements at the position this week with just four healthy linebackers on the roster in Keith Ellison, Nic Harris, Ashlee Palmer and Jon Corto.