Rookie outside linebacker Ryan Kerrigan was back on the practice field in a limited capacity as the Washington Redskins kicked off their fourth day of training camp.

The 16th overall pick of the NFL draft, Kerrigan suffered a bone bruise in his right knee on Friday and had been sidelined ever since.

An MRI showed no structural damage.

The 6-foot-4, 263-pound Kerrigan wore a brace on the knee as he jogged through agility drills. When the defense ran through sprints and positional work, Kerrigan watched.

Also on hand Tuesday morning were running back Tim Hightower and kicker Shayne Graham. The Redskins on Sunday traded defensive end Vonnie Holliday and an undisclosed draft pick to Arizona in exchange for Hightower, a former Episcopal High School and University of Richmond standout. Hightower arrived at Redskins Park on Monday evening.

Because he wasn’t a free agent acquisition, Hightower could have practiced with the team, but instead, he stood next to running backs coach Bobby Turner and wore only T-shirt and shorts.

Graham agreed to terms with the Redskins on Monday and also arrived later that day. He will compete with Graham Gano for the kicker job. Because he was a free agent signing, however, Graham cannot practice until Aug. 4, after the new collective bargaining agreement has been ratified.