With Polk out, Eagles sign RB Tucker

PHILADELPHIA -- The Philadelphia Eagles made a minor roster tweak Saturday, adding running back Matthew Tucker to their active roster a day before their NFC East showdown with the Dallas Cowboys.

Tucker will dress in place of Chris Polk, who injured his shoulder last week in Tampa. Polk has been active for all six games, but has played mostly on special teams. He has been on the field for just nine offensive plays.

But the Eagles have only two other running backs on their roster: starter LeSean McCoy and backup Bryce Brown. Coach Chip Kelly said he didn’t want to go into a game without a third running back active.

To clear roster space, the Eagles released rookie cornerback Jordan Poyer. A seventh-round draft pick from Oregon State, Poyer was inactive last Sunday. He is the second of the Eagles’ 2013 draft picks to be released. Seventh-rounder David King was the other.

Tucker was an undrafted free agent who played college ball at TCU. He had 25 carries for 89 yards and two touchdowns in the preseason.