Per sources, the Texans are promoting LBs coach Mike Vrabel to defensive coordinator. Romeo Crennel expected to stay, likely as ass't HC.
Fantasy Impact:
In the last two seasons, Houston's defense has ranked in the top 11 in both yards and points allowed, and last year it gave up the fewest yards in the league, and that was without J.J. Watt in the fold. Both coaches have been promoted and it's not entirely clear who will be running the defense, though Vrabel's job title indicates that he's in charge.