Nick Saban will soon need to hire another new coach.

The Pittsburgh Steelers are hiring Crimson Tide defensive line coach Karl Dunbar as their defensive line coach, according to a source.

This gets Dunbar back to the NFL, where the 50-year old had been for most of his coaching career before heading to Alabama in 2016 as the replacement for Bo Davis.

It will be the fifth NFL team he's worked for after stints as the defensive line coach for the Chicago Bears (2004), Minnesota Vikings (2006-11), New York Jets (2012-14) and Buffalo Bills (2015).

For Alabama, it means more change among the coaching staff.

At least half of the Tide's 10-person staff will be coaches who weren't with last season's national championship-winning team.

Dunbar is the fourth coach to leave since the end of the year, along with defensive coordinator Jeremy Pruitt (Tennessee), offensive coordinator Brian Daboll (Buffalo Bills) and defensive backs coach Derrick Ansley (Oakland Raiders).

Whoever replaces Dunbar will be the fifth new coach Saban has hired since late December.

The Tide has already added Karl Scott as defensive backs coach, Josh Gattis as wide receivers coach, Dan Enos as quarterbacks coach and Pete Golding for the new 10th assistant spot.

Alabama is also expected to promote Tosh Lupoi to defensive coordinator, according to sources, after he spent last season as co-defensive coordinator and outside linebackers coach.

Now, Bama needs to find a new defensive line coach.

Matt Zenitz is an Alabama beat writer for the Alabama Media Group. Follow him on Twitter

.