The Washington Times - August 25, 2011, 08:26PM

So far this preseason the Redskins’ defense has been the best in the league – not giving up a whole lot of points or yards. Veteran nose tackle Barry Cofield credited depth along the defensive line for that – so the team got a scare early in the first quarter Thursday night.

Less than four minutes into the preseason game against the Ravens, defensive end Jarvis Jenkins suffered a sprained right knee. He was on the turf near midfield at M&T Bank Stadium for a few minutes before being helped off and onto the sideline.

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Darrion Scott replaced Jenkins along the defensive line. Jenkins did not return, and coach Mike Shanahan said Jenkins will have an MRI on Friday.

The rookie out of Clemson has impressed defensive coordinator Jim Haslett.

“Jarvis is a smart kid, big, he’s 325, maybe a little more. He’s a powerful guy,” Haslett said. “I think he just needs time on the grass. And the more those guys get, the more time they’re out there, the better they’re gonna be.”