Bills add Roman, let Schwartz go

One day after hiring Rex Ryan as their head coach, the Buffalo Bills hired Greg Roman as their offensive coordinator Tuesday and terminated the contract of defensive coordinator Jim Schwartz.

Schwartz and Ryan spoke this week about the direction of the defense, a source told ESPN NFL Insider Adam Caplan, and decided to part ways because of differing philosophies.

"I have the utmost respect for Jim and what he has been able to accomplish throughout his career and I know he feels the same about me," Ryan said of Schwartz in a statement. "Jim's defenses are always tough and ranked near the top of the league standings. I wanted to give Jim the opportunity to pursue other opportunities and so we have terminated his contract.

"He did a terrific job with the Bills defense this past year and our plan is for our defense to continue to play well and be a dominating force."

Ryan is expected to hire former New York Jets defensive coordinator Dennis Thurman for the same position in Buffalo. Ryan also wants several members of his former Jets staff, including defensive line coach Karl Dunbar and defensive backs coach Tim McDonald, to follow him to the Bills, sources told ESPN's Rich Cimini.

Roman joins the Bills after four seasons (2011-14) as the San Francisco 49ers' offensive coordinator.

The Bills, who will introduce Ryan at a news conference Wednesday, have yet to announce any other changes to their coaching staff.