"He will be out for a while now," Redskins coach Jim Zorn said. "I don't know if it's going to be season-ending."
The news is another blow to a Redskins offense that already was without starting linemen Chris Samuels and Randy Thomas. Washington (2-5) has failed to score more than 17 points in any game this season.
"When it rains, it pours," center Casey Rabach said. "We just keep taking hits on the offensive side of the football at http://www.betrepublic.com/
Cooley entered Monday's game with a team-high 27 catches for 311 yards and two touchdowns. Quarterback Jason Campbell's first four throws against the Eagles on Monday were to Cooley.
Cooley went to the Pro Bowl after each of the last two seasons and never has missed a game since entering the NFL in 2004.
"Losing Chris is big," Campbell said.
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