Redskins' Griffin diagnosed with knee sprain

The Washington Redskins announced that starting quarterback Robert Griffin III sustained a sprained right knee that kept the rookie standout out for the final stages of Sunday's 31-28 overtime win over the Baltimore Ravens.

Griffin got his knee twisted after taking a shot from Ravens defensive tackle Ma'ake Kemoeatu while scrambling for a first down on what would be the eventual game-tying drive late in the fourth quarter. The 2012 No. 2 overall draft pick briefly returned after one play to complete a pair of passes, including a 22-yarder to Pierre Garcon that brought Washington to the Baltimore 16 with around a minute left in regulation, but limped off for good after throwing the ball away while under pressure on the next snap.

X-rays taken following the game turned up negative for a tear, with Griffin's status for next Sunday's matchup at Cleveland to be determined later in the week.

Fellow rookie Kirk Cousins replaced Griffin and threw an 11-yard touchdown pass to Garcon with 29 seconds left in the fourth quarter to pull Washington within 28-26, then converted the ensuing 2-point conversion try on a quarterback draw to force overtime.

Griffin went 15-of-26 for 246 yards and a touchdown before exiting, while adding 34 rushing yards on seven attempts.

The 22-year-old has started every game this season for Washington, which has vaulted back into playoff contention in the NFC by ripping off four consecutive victories. Griffin leads all NFL quarterbacks with 714 rushing yards and entered Sunday's clash second in the league with a 104.4 passer rating.

Griffin has completed 68.5 percent of his throws with 10 touchdowns and just one interception over the course of Washington's current unbeaten run.

The Redskins are presently one game behind the New York Giants for first place in the NFC East and trail by the same margin in the race for the conference's two Wild Card berths.