UPDATE (7:43 p.m.): Mike Garafolo of NFL Network has reported that initial expectations for Bud Dupree's injury are dire.
Garafolo reported that early tests indicate a torn ACL for Dupree, who left the Steelers-Ravens game after sustaining the injury.
Test confirmation pending, the Steelers are expecting Dupree to be out for the remainder of the season.
ORIGINAL: The Steelers moved to 11-0 but may have lost one of their key pieces on defense to a serious injury.
Pittsburgh Steelers fans are holding their collective breath after Bud Dupree went down with a knee injury.
During a play late in the fourth quarter the Steeler linebacker was rushing Ravens quarterback Trace McSorley when his knee gave out.
Dupree immediately started pounding the ground in frustration, a bad sign.
Dupree then limped off the field and threw his helmet in frustration.
After being looked at on the bench, Dupree limped into the locker room to be evaluated.
He did not return to the game.
Dupree and his fellow linebacker T.J. Watt have the most combined sacks in the NFL.
