Steelers coach Mike Tomlin told reporters that Harrison will be out "a number of weeks," during his weekly press conference todfay.
Meanwhile, defensive end Aaron Smith has a sprained foot and could miss the Steelers' next game against the Tennessee Titans. Plus, outside linebacker Jason Worilds has a strained quadriceps.
The Steelers are encouraged by quarterback Ben Roethlisberger. His sprained left foot isn't expected to sideline him this week.
For more coverage of the Steelers go to Steel City Digest at pit.scout.com.
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James Harrison to miss several weeks
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