Harrison has spent his entire nine-year career as a mainstay of the Steelers defense at the linebacker position. Last season, Harrison recorded 49 tackles and six sacks while forcing two fumbles in 12 games for the Steelers. He tallied 64.5 sacks and 4o2 tackles during his nine years in Pittsburgh.
Harrison was released by the Steelers on March 9 after failing to agree upon a salary reduction.
The Bengals will play the Steelers in Week 2 and Week 15 of the 2013 NFL regular season.