A Chicago native and Hubbard High School alum, Cattouse (6-foot-2, 210 pounds) came into the NFL last season with the San Diego Chargers as an undrafted free agent out of the University of California, where he was a three-time All-Pac 12 selection.
Cattouse played in 49 games for Cal with 26 starts, collecting 185 tackles, seven interceptions and 17 pass breakups. Cattouse also contributed seven tackles for lost yardage, two sacks and a pair of fumble recoveries.
The Bears worked out Cattouse on Sept. 17, according to a league source.
Unga joined the Bears in 2010 as a supplemental draft pick out of Brigham Young University, but spent his rookie season on injured reserve. Then in 2011, Unga left the team for personal reasons, before spending all of last season on the practice squad.
In four seasons with the Bears, Unga never played in a regular-season game.