Having been rebuffed by Cincy in their efforts to hire Vance Joseph, the Broncos have reportedly reached out to former DC and head coach Wade Phillips about running their defense.
Phillips spent the 2014 season out of the NFL; from 2011 to 2013, he was Houston's DC under Gary Kubiak, and took over on an interim basis after Kubiak was fired. He was Denver's DC from 1989 to 1992 and their head coach the next two years, when he essentially served as the placeholder until Mike Shanahan felt ready to take over the team.
In the intervening years, Phillips also held head coaching jobs with Buffalo and Dallas, plus DC gigs with Buffalo, Atlanta, and San Diego.
As personnel go, Denver already has plenty of smaller and faster linebackers to run a Phillips 3-4, but not the bigger linemen it requires, save for Terrance Knighton, who will soon be an unrestricted free agent.