Attachou (pectoral) was released by the Bears on Monday, Kevin Fishbain of The Athletic reports.
Attaochu presumably was let go to help make room for free-agent nose tackle Mike Pennel, whom the team signed in a corresponding move Monday. The 29-year-old linebacker played 124 defensive snaps over five games before a torn pectoral that forced him to finish last season on the Bears' injured reserve list. Attaochu signed a two-year, $5.5 million contract with Chicago ahead of the 2021 campaign, but he ultimately was a long shot to make the team's final 53-man roster this time around while coming off such a severe season-ending injury.