Green Bay Packers rookie running back Eddie Lacy was knocked out of Sunday's game against the Washington Redskins with a concussion.

Lacy suffered the injury at the end of his first carry of the game a 10-yard run on the Packers' opening series.

Lacy took a hit from Redskins safety Brandon Meriweather who was not penalized on the play. The Packers took Lacy to the locker room and ruled out him for the remainder of the game.

Lacy's absence left the Packers with only two available running backs James Starks and rookie Johnathan Franklin.