The Denver Broncos have named defensive coordinator Jack Del Rio as interim coach as John Fox prepares for surgery and takes a leave of absence from the team. Del Rio was Jacksonville’s head coach for nine seasons. He was fired toward the end of 2011.

The 58 year old Fox will undergo aortic valve replacement this week in Charlotte, NC. Fox was nearby Charlotte on Saturday when he experienced dizziness while playing golf. He was transported to a hospital where it was determined immediate attention was needed.

Fox released a statement on Saturday night

“I sincerely appreciate all of the support from friends, Denver Broncos fans and so many around the league today. Although I am disappointed I must take some time away from the team to attend to this pre-existing health condition, I understand that it’s the right thing to do. I have great confidence in our coaches and players, who are fully committed to our goals. I look forward to returning to coaching as soon as possible.”

Denver had a bye week this past weekend and will travel to San Diego for an AFC West matchup on Nov. 10, before a Sunday night matchup on Nov. 17, when the Broncos host the Chiefs. Kansas City is in their bye week.