NFL-National Football League roundup

April 14 (The Sports Xchange) - South Carolina defensive end Jadeveon Clowney will not conduct additional private workouts with NFL suitors, according to Sports Illustrated's Peter King. Clowney, in contention to be drafted first overall by the Houston Texans in the 2014 NFL Draft, has a mix of size and explosiveness to draw comparisons to elite pass rushers past and present. - - Detroit Lions cornerback Rashean Mathis re-signed with the team Monday, agreeing to a one-year deal. Mathis joined the Lions last season and became a valuable mentor to Detroit's young defensive backs. He started 13 games, led the team with 15 pass breakups in 2013. - - San Francisco 49ers cornerback Chris Culliver pleaded not guilty to misdemeanor hit-and-run charges and felony possession of brass knuckles. Culliver was arrested March 28 after he allegedly struck a bicyclist and then hit a witness' vehicle that was blocking him from leaving until officers arrived, according to San Jose police. - - The Cleveland Browns signed fullback Chris Pressley to a one-year deal. Pressley formerly started for the Cincinnati Bengals. At 5-foot-10 and 249 pounds, he is considered a strong lead blocker. Pressley, a six-year pro out of the University of Wisconsin, tore an ACL during the 2012 season and missed all of last year while recovering from the injury. - - The San Diego Chargers waived linebacker Terrell Manning. Manning was claimed off waivers from the Green Bay Packers in 2013, but he played in just one game for the Chargers last season. (Editing by Frank Pingue)