Robert Griffin is injured on a hit by Falcons linebacker Sean Weatherspoon (Toni Sandys/Washington Post)

Washington Redskins quarterback Robert Griffin III suffered a blow to the head in the third quarter of his team’s matchup with the Atlanta Falcons and had to leave the game.

 With his team facing third-and-goal from the Atlanta 3-yard line, Griffin took the snap and rolled to his right, looking for a receiver in the end zone.

 He tucked the ball and tried to turn the corner, and was drilled by Falcons linebacker Sean Weatherspoon, whose right side connected with the left side of Griffin’s head. Griffin lay face-down along the far sideline, and had to be helped up. He was wobbly as he headed to the sideline.

 Griffin sat on the bench and appeared to be treated for a bloody lip, and then  was taken to an observation area beneath the stands behind Washington’s bench.

 After several minutes, Griffin came out and walked slowly to the locker room with members of Washington’s training staff, and team doctor Anthony Casolaro.

The Redskins announced Griffin’s status as “shaken up, questionable to return.”

 Rookie fourth-round pick Kirk Cousins warmed up on the sideline, and entered the game for a three-and-out series before the fourth quarter ended. Cousins threw a 77-yard TD to Santana Moss on the next series