Outside linebacker Chris Clemons suffered a knee ligament injury in Saturday's 35-20 win over the New York Giants and he could be sidelined at least 2-3 weeks, team officials said.
The Redskins will update Clemons' status later in the week, when the team is required to submit an injury report.
Clemons, who was diagnosed with a tear in the medial collateral ligament, suffered the injury late in the second quarter on a kickoff return. He did not return to the game.
The loss of Clemons could be significant. The third-year linebacker has emerged as a pass-rushing threat on defense, coming in primarily on third downs in place of strong-side linebackers LaVar Arrington or Warrick Holdman.
This season, Clemons has logged 10 tackles, two sacks, seven quarterback pressures and one forced fumble. He has five career sacks.
"Chris has come a long way in the short amount of time that we've worked with him," assistant head coach-defense Gregg Williams said earlier this season.
-- ROGERS UPDATE
Cornerback Carlos Rogers is expected to test his biceps injury and he could participate in practice later this week, team officials said.
Rogers has missed the last two games due to the injury. If the injury responds well to the increased workload, Rogers could be available to play in this Sunday's game at Philadelphia.
Walt Harris replaced Rogers in the starting lineup in the win over the Giants.
Meantime, safety Matt Bowen has shown improvement in his knee injury and he could be available to play in Sunday's game at Philadelphia. Like Rogers, Bowen has also missed the last two games.
-- COOLEY'S RECORD
With Chris Cooley's five catches in Saturday's win, the 6-3, 265-pound H-back set a team record for most catches by a tight end or H-back. He broke the previous record of 67 by tight end Jerry Smith in 1967.
Cooley now has 69 catches this season for 766 yards and seven touchdowns.
-- JACOBY VISITS
Redskins great Joe Jacoby, an offensive tackle in Washington from 1981-93, visited Redskins Park on Monday.
Jacoby is one of several former Redskins who have visited the team's training facility in recent weeks.
Ed Simmons, an offensive lineman for the Redskins from 1987-97, was at Redskins Park two weeks ago.
Defensive end Dexter Manley, who starred in Washington from 1981-89, visited last week.
And former Redskins quarterback and current ESPN broadcaster Joe Theismann has been at Redskins Park several times in recent weeks.