Oakland Raiders defensive coordinator Rob Ryan after the Raiders lost to the St. Louis Rams 20-0 in their NFL game, Sunday, Dec. 17, 2006 in Oakland, California. (AP Photo/Paul Sakuma)

Oakland Raiders defensive coordinator Rob Ryan reacts during a game against the Baltimore Ravens Sunday, Oct. 26, 2008, in Baltimore. (AP Photo/Gail Burton)

Oakland Raiders defensive coordinator Rob Ryan talks to players during the second half of the NFL football game against the Buffalo Bills at Ralph Wilson Stadium in Orchard Park, N.Y., Sunday, Sept. 21, 2008. (AP Photo/David Duprey)

Baltimore Ravens' defensive coordinator Rex Ryan, left, jokes with his twin brother Rob Ryan, the Oakland Raiders defensive coordinator, before the start of an NFL football game in Baltimore. (AP Photo/Rob Carr)

Cleveland Browns defensive coordinator Rob Ryan talks with his dad, Buddy Ryan, at the Cleveland Browns NFL football training camp Sunday, Aug. 2, 2009, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns defensive coordinator Rob Ryan, right, greets Green Bay Packers cornerback Charles Woodson (21) before an NFL football game, Sunday, Oct. 25, 2009, in Cleveland. (AP Photo/Mark Duncan)

Cleveland Browns defensive coordinator Rob Ryan, left, watches an NFL football training camp practice with linebacker Scott Fujita (99) Tuesday, Aug. 10, 2010, in Berea, Ohio. (AP Photo/Mark Duncan)

Cleveland Browns defensive coordinator Rob Ryan is seen working the sidelines against the Cincinnati Bengals in their NFL football game on Sunday, Oct. 3, 2010, in Cleveland. (AP Photo/Amy Sancetta)

Head coach Rex Ryan of the New York Jets on the field with his brother, defensive coordinator for the Cleveland Browns, Rob Ryan on Sunday, November 14, 2010 in the Cleveland Browns Stadium in Cleveland, Ohio. (AP Photo/David Drapkin)

Cleveland Browns defensive coordinator Rob Ryan runs onto the field during an NFL football game against the New York Jets in Cleveland. (AP Photo/David Richard)

Dallas Cowboys defensive coordinator Rob Ryan, second from left, talks with Keith Brooking (51), Bradie James (56), Anthony Spencer (93) and DeMarcus Ware, right, during NFL football training camp, Friday, July 29, 2011, in San Antonio. (AP Photo/Eric Gay)

Defensive Coordinator Rob Ryan of the Dallas Cowboys, Buddy Ryan, their father, and Coach Rex Ryan of the New York Jets on the field before the game on Sunday, September 11, 2011 at MetLife Stadium in East Rutherford, New Jersey. The Jets beat the Cowboys 27-24. (AP Photo/David Drapkin)

Dallas Cowboys defensive coordinator Rob Ryan celebrates a defensive play during an NFL football game against the Washington Redskins Sunday, November 20, 2011 at FedEx Field in Landover, Maryland. The Cowboys won the game in overtime, 27-24. (AP Photo/James D Smith)

Dallas Cowboys defensive coordinator Rob Ryan during an NFL preseason football game against the St. Louis Rams in Arlington, Texas on Saturday, August 25, 2012, at Cowboys Stadium. The Cowboys defeated the Rams, 20-19. (AP Photo/James D Smith)