Marvin Lewis, former Bengals coach
Lewis is a special advisor at Arizona State and seems comfortable in his current role. However, he’s at least open to coming back to the NFL, taking an interview with the Cowboys. Lewis catches a lot of flak for being a coach who can’t win in the playoffs, but as a defensive coordinator, he can still get the job done.
Lewis was the defensive coordinator of the dominant Ravens defense that won the Super Bowl in 2000 and helped Baltimore rank second in the NFL in points allowed three years in a row from 1999-2001. If McVay wants another experienced coach in the mold of Phillips, Lewis would make sense.