The Bengals were looking for the veteran defensive coordinator to accompany Zac Taylor in his first head coaching gig.

After hiring Lou Anarumo two weeks ago, they added another in that mold on Thursday.

The Bengals officially added Mark Duffner as the senior defensive assistant under Anarumo, as well as Gerald Chatman as a defensive assistant.

Those additions bring the coaching staff to 22 under Taylor, the most in Bengals history. Marvin Lewis had 19 coaches under him last year.

Duffner arrives familiar with the operation. He served as linebackers coach and defensive coordinator with the Bengals from 1997-2002. He's been a linebackers coach across the league since, spending the last three seasons with Tampa Bay.

When the Bucs fired defensive coordinator Mike Smith midseason last year, Duffner took over. At 65 years old, he's the eldest member of this young coaching staff, 11 years older than 54-year-old offensive line coach Jim Turner. The average age of the staff is 37.5.

Chatman, 30, will serve as an assistant in his first NFL coaching role. He took part in the NFL coaching internship program with multiple teams, including Cincinnati last summer. He spent the last two seasons as a coach at Tennessee State leading defensive line and outside linebackers. Last year he added the role of special teams coordinator.