Griffin concussed in Redskins pre-season win

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Quarterback Robert Griffin III of the Washington Redskins is sacked by Phillip Hunt of the Detroit Lions during a pre-season game at FedEx Field on August 20, 2015 in Landover, Maryland (AFP Photo/Matt Hazlett)

Washington (AFP) - Washington Redskins quarterback Robert Griffin III faces a spell on the sidelines after being concussed in a pre-season victory over the Detroit Lions, it was confirmed Friday.

Griffin left the game in the second quarter of the Redskins' 21-17 win on Thursday after suffering a torrid time at the hands of Detroit's defense.

Redskins head coach Jay Gruden said it was unclear how long Griffin would be out of action, or whether he would recover in time for next Saturday's pre-season game against the Baltimore Ravens.