According to espn, Ryan Shazier sprained his MCL last night against the Panthers.
http://espn.go.com/nfl/story/_/id/11567769/pittsburgh-steelers-defense-l...
I'm sure I'm not alone in wishing him a speedy recovery. He was one of my favorite players the last three years at Ohio State and I think he's destined for a productive career in the League. Let's just hope this is a minor setback.