Rob Jackson missed the first four games of the 2013 season.

ARLINGTON, Tex. — Defensive end Jarvis Jenkins and linebacker Rob Jackson are active for the Washington Redskins’ game here Sunday night against the Dallas Cowboys.

It is the first game of the season for which Jenkins and Jackson are eligible to play. They sat out the Redskins’ first four games while serving suspensions for violations of the NFL’s drug policies.

Coach Mike Shanahan and defensive coordinator Jim Haslett said during the week they were evaluating Jenkins and Jackson in practices before making a decision about what roles, if any, the two would play in the game. The coaches previously had not ruled out having Jenkins and Jackson on the inactive list for the game.

Rookie safety Bacarri Rambo and rookie running back and punt returner Chris Thompson are on the Redskins’ inactive list. It is the first time this season that either one has been inactive for a game. Rambo began the season as a starter but was benched and fell out of the playing rotation. Thompson won the team’s punt-returning job during the preseason after Richard Crawford was hurt, but he and the Redskins have struggled in that area.

Josh Morgan is scheduled to return punts Sunday night, according to the Redskins, with Thompson inactive. Fellow wide receiver Santana Moss also could be a candidate.

Reed Doughty is scheduled to start at safety alongside Brandon Meriweather, the Redskins said.

Quarterback Rex Grossman, safety Jordan Pugh, linebacker Brandon Jenkins, guard Josh LeRibeus and defensive tackle Chris Neild also are inactive for the Redskins.

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