Mich. assistant Montgomery leaves for OU

Michigan coach Brady Hoke often has said his staff includes three defensive-line coaches: himself, defensive coordinator Greg Mattison and the actual line coach, Jerry Montgomery.

The Wolverines are down to two as Montgomery has accepted the same job on Oklahoma's staff, sources have told ESPN RecruitingNation's Tom VanHaaren and Jake Trotter. Montgomery is the first assistant to depart Michigan since Hoke took over before the 2011 season.

Neither team has made an official announcement about Montgomery, but Michigan defensive tackle Ondre Pipkins tweeted about the coach's departure Saturday, thanking Montgomery and wishing him luck at OU. Montgomery will replace Jackie Shipp, the Sooners' longtime defensive-tackles coach who wasn't retained for 2013Insider.

Montgomery did a solid job for Michigan both on the field and on the recruiting trail. He certainly had security in Ann Arbor, but the move makes sense if he can grow professionally more with Oklahoma. After all, both Hoke and Mattison are heavily involved with Michigan's defensive line; Montgomery might have more autonomy with Oklahoma. Would he have been the top choice to succeed the 63-year-old Mattison as coordinator? Perhaps, but Mattison shows no signs of slowing down, and Hoke certainly could find a coach with previous FBS coordinator experience.

Montgomery briefly accepted a job with Indiana 2011 before joining Michigan's staff. The former Iowa Hawkeye also has coached defensive line at Wyoming and Northern Iowa.