The Bengals added S Tom Nelson to their 53-man roster on Friday.
Nelson, a second-year player out of Illinois State, suffered a knee injury in the last regular-season game of 2009. He was placed on the physically-unable-to-perform list on Aug. 30.
Nelson played in 12 games with three starts as a rookie, recording 23 tackles, an interception, and two passes defensed. He also had four special-teams tackles.