Purdue already lost defensive coordinator Brad Lambert to Wake Forest and now it sounds like the program will be losing an assistant on the offensive side of the football.

Wednesday afternoon, Tom Dienhart of Gold & Black Illustrated reported that co-offensive line coach Neil Callaway is expected to retire. The news comes after Purdue posted its best-ever season under head coach Jeff Brohm, finishing 9-4 with a win in the Music City Bowl.

The Boilermakers also defeated No. 2 Iowa and No. 3 Michigan State — both were undefeated at the time of play — during the season.

Callaway has spent the past two seasons with the Boilermakers. He was also on Brohm’s staff at Western Kentucky from 2013-15, where he was the offensive line coach.

Callaway’s coaching tenure stretches across four decades. He started at Wyoming in 1980 and had multiple stops throughout his career, most of those coming in the SEC.

Prior to arriving at Purdue, Callaway was an assistant at Wyoming, Auburn, Houston, Alabama, Georgia, UAB, Western Kentucky and USC.

Brohm will now be on the search for another assistant this offseason to fill Callaway’s shoes.