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The 24-year-old Sylvester has appeared in 41 games during his three seasons, playing primarily on special teams. He has eight career tackles and two forced fumbles but missed six games in 2012 due to a knee problem.
The Steelers are in need of bodies at linebacker after cutting 2008 NFL Defensive Player of the Year James Harrison last month. Pittsburgh is not counting on 2012 third-round pick Sean Spence to be ready anytime soon. Spence severely injured his left knee in Pittsburgh's final preseason game last August.
Copyright 2013 by The Associated Press