Maurkice Pouncey suffered a torn ACL and MCL in his right knee and will miss the rest of the 2013 NFL season.
Pouncey is a three-time Pro Bowler at center for the Pittsburgh Steelers.
"You never like to see a guy get hurt, regardless of who it is," said Ben Roethlisberger. "[Pouncey] is our captain and our leader, and obviously a very good friend. It's tough."