The Colts are set to hire Steelers LB coach Keith Butler for their vacant defensive coordinator job, according to an ESPN report. Butler is planning to fly to Indianapolis on Tuesday, when he is expected to sign a contract.

Butler's contract with Pittsburgh is coming to an end, and although the team would like to renew it, Butler is reportedly interested in advancing to a coordinator's position.

Butler, 55, has been a member of the Steelers' coaching staff since 2003, and he had been considered the heir apparent to defensive coordinator Dick LeBeau. However, LeBeau, 74, who reportedly works on a year-to-year agreement, has given no indication that he is considering retirement.

Mike Murphy, who took over the Colts' defensive coordinator job in Week 13 this past season after Larry Coyer was fired, announced his retirement earlier this month.

If Butler does indeed join the Colts, he would make the second Steelers assistant coach to be hired by the Colts, who are expected to announce Bruce Arians as their offensive coordinator early this week. Arians was the Steelers' offensive coordinator last season but was told the team wasn't planning to renew his contract.

Butler would be reunited with new Colts head coach Chuck Pagano. Pagano, Butler and Arians were on the staff in Cleveland in 2001-02 under then-Browns head coach Butch Davis.