Mike Tomlin will have yet another opening on his coaching staff to fill after assistant Scottie Montgomery accepted a job with Duke University, his alma mater.

Montgomery, who coached the Steelers wide receivers, became the third assistant to leave the team since the end of the season and the second to return to the college ranks. He will become the co-offensive coordinator at Duke, a source told the Pittsburgh Post-Gazette, and would be in line as the heir apparent to Blue Devils head coach David Cutcliffe. Cutcliffe, 58, received a contract extension through 2019.

Montgomery coached the wide receivers at Duke for four seasons before joining the Steelers staff in 2010. He was among Duke's all-time leading receivers.

Tomlin has hired two coaches since the end of the season, Jack Bicknell Jr. as his offensive line coach and Danny Smith to coach the special teams. He had not filled a third position and now has two coaches to hire.