IRVING (AP) – The Dallas Cowboys have hired Bill Callahan as their new offensive line coach and added a surprise twist, listing him as offensive coordinator.

Jason Garrett came to Dallas as offensive coordinator in 2007 and held on to that position after he became head coach midway through the 2010 season. There was no indication of how Callahan having that title would change, if any, Garrett calling plays or other coordinator duties.

Dallas also Thursday hired Jerome Henderson as its new secondary coach.

Callahan replaces retiring offensive line coach Hudson Houck, who spent 13 of his 29 NFL seasons with Dallas. Secondary coach Dave Campo spent 18 seasons with the Cowboys, three as head coach. The contracts of both coaches expired at the end of the season.

(Copyright 2012 by The Associated Press. All Rights Reserved.)