Almost immediately after Bill O'Brien was hired as the head coach of the Texans, it was reported that former Browns and Chiefs head coach Romeo Crennel would take over as the franchise's next defensive coordinator.

According to CBS Sports' Jason La Canfora, Crennel finally has agreed to a three-year deal to run the defense in Houston.

The move makes sense. Crennel has had success as a defensive coordinator in the NFL -- with the Browns, Patriots and Chiefs -- and O'Brien and Crennel both come off the Bill Belichick coaching tree.

As a coordinator, Crennel's biggest success came in New England when the defense was ranked No. 1 in points allowed in 2003 and No. 2 in 2004. That led Crennel to landing the Browns head coaching job where he went 24-40 in four seasons (he also recorded a 4-15 mark as the head coach in Kansas City). Crennel was out of football in 2013.

As for Wade Phillips, the last Texans defensive coordinator who helped turn around the entire unit from one of the worst in the league to one of the best, he's having a tough time in the job market.