Standout rookie DE Cassius Marsh leaves practice with knee injury

RENTON, Wash. -- The Seahawks were holding their breath, after one of their standout rookies left practice with a knee injury Wednesday.

Fourth-round pick Cassius Marsh, a defensive end, is undergoing an MRI on that knee to see the extent of the damage.

Coach Pete Carroll did not address the media after practice Wednesday, but he's scheduled to speak after Thursday's final practice before Friday night's home preseason game against the San Diego Chargers.

Marsh was one of the standout players in the Hawks preseason game last week in Denver. He had a sack and got into the Broncos backfield on a consistent basis.

He was injured early in Wednesday's practice when he got tangled up with a couple of players at the line of scrimmage. He did not return.

In better news, the team officially ended training camp Wednesday -- which only means that the players no longer have to stay together at a hotel.

Their focus is squarely on their first home preseason game.

"Our preseason game, number two, it's gonna be electric," quarterback Russell Wilson said. "We're playing the San Diego Chargers and I've got a lot of respect for them and their head coach and, obviously, Phillip Rivers. We know it's gonna be a battle and we're looking forward to being back in that stadium again, playing on that turf, and seeing those fans and seeing how nuts they are."

Earlier Wednesday, Carroll told sports radio KJR that left tackle Russell Okung would not play on Friday, but center Max Unger and left guard James Carpenter would see some time.

A reminder -- you can see the Seahawks game Friday night on Q13 FOX. Pregame coverage starts at 6 p.m., kickoff is at 7 p.m.