The Chicago Bears are looking to fill a rather large void on their coaching staff. Defensive coordinator Vic Fangio left the team in order to ​become the new head coach for the Denver Broncos.

Now, the Bears are looking at a former head coach to be Fangio's successor.

Chicago is reportedly interested in interviewing former Indianapolis Colts head coach Chuck Pagano for their defensive coordinator vacancy.​

The Bears are looking for a candidate who can run the 3-4 defensive scheme like Fangio ran for the past couple of years. Pagano has history running that scheme, most notably as defensive coordinator for the Baltimore Ravens in 2011. He also served in numerous defensive backs/secondary coaching roles throughout the NFL, including with the Ravens, Cleveland Browns and Oakland Raiders.

Chicago will have to compete with a variety of teams for Pagano's services, as he's been linked to the Browns and Arizona Cardinals vacancies at defensive coordinator. Pagano also spoke with the Carolina Panthers about their secondary coach opening.

If the Pagano plan falls through for Chicago, they have an in-house candidate in defensive backs coach Ed Donatell, who interviewed for the job on Thursday. 

Donatell would provide the most seamless transition for Chicago, but it's up to Matt Nagy and Ryan Pace to make their choice.