"Jason Garrett will enter his second full season as a head coach with someone to lean on.

That's how he described new offensive line coach and offensive coordinator Bill Callahan in a news conference Thursday at Valley Ranch to introduce him and new secondary coach Jerome Henderson.

"I'm going to lean on him a lot of different ways," Garrett said of Callahan, the former Oakland Raiders and Nebraska head coach. "He's had great run offenses. He's had great pass offenses. To have that exposure to him, a guy who has so much experience, he's just going to help us in so many ways.""