Matchup: With Matt Hasselbeck filling in for the injured Jake Locker at quarterback, the Steelers want to pressure the aging veteran. The Steelers plan to do that with the matchup of James Harrison on Michael Roos. Even though the Titans haven't run well this season, they have protected their quarterback: They have allowed only eight sacks.
Harrison: He returned to the field last week for the first time since January and provided the Steelers with a spark. Harrison played all 57 snaps on defense and came away with three hits and three pressures on Eagles quarterback Michael Vick. With LaMarr Woodley out because of a hamstring injury, the Steelers are limited from where they can bring pressure.
Roos: He is athletic for his size (6-foot-7, 315 pounds) and durable. Roos has started every game in his eight-year career (117 consecutive), including the past 97 at left tackle. He also started the final 35 games of his collegiate career at Eastern Washington. The former second-round pick in 2005 has gone against Harrison three times, allowing three sacks.
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