AUBURN – Charlie Harbison, Auburn’s co-defensive coordinator and safeties coach for the past two seasons, was told Sunday he will not be retained on the defensive staff with new coordinator Will Muschamp, knowledgeable sources told AuburnUndercover..

Harbison is the third defensive coach to be fired since the end of the regular season, joining coordinator Ellis Johnson and cornerbacks coach Melvin Smith. Muschamp was introduced last month as Auburn’s new defensive coordinator. Former All-SEC Auburn safety Travaris Robinson joined the staff on Saturday.

Harbison served as acting defensive coordinator in Auburn’s 34-31 overtime loss to Wisconsin in the Outback Bowl. He said before the game that he recognized his future was uncertain.

“I’ve been in this business for a while, and it’s part of it,” Harbison said. “I just let my work speak for itself, and I just continue to go forward. In this business, things like that happen. We just keep moving on, just take the next step.”

Harbison has coached college football for 23 years. He was co-defensive coordinator at Clemson when he joined head coach Gus Malzahn’s first staff after the 2012 season. He helped the Tigers win an SEC championship and play in the BCS Championship Game in 2013.

Harbison was also formerly the defensive coordinator at Mississippi State.