The Eagles will be missing their top pass rusher for the rest of training camp and possibly the entire preseason.

Jason Babin, who made the Pro Bowl last season after collecting a team-high 16 1/2 sacks, will be out two to three weeks after straining his right calf during a pass rushing drill last Saturday at Lehigh University. Babin's injury was confirmed by an MRI taken Monday. He had to wait to undergo the test until an internal thermometer he had swallowed to test his core temperature had passed through his system.

Babin's injury gives other defensive ends an opportunity to impress the coaching staff. Rookie Vinny Curry, Brandon Graham, Phillip Hunt and Darryl Tapp are among the players fighting for roster spots behind Babin and Trent Cole.

In other news Tuesday, the Eagles announced that they waived/injured wide receiver Ron Johnson and signed free agent wide receiver Andrew Brewer.

Johnson suffered a fractured/dislocated left ankle during Monday's afternoon practice. Johnson had surgery Tuesday at Jefferson Hospital at the Naval Yard in Philadelphia. Drs. Peter DeLuca and Steve Raikin performed the operation.

Brewer, 6-foot-3 and 215 pounds, has connections with the Eagles. He was a college teammate of Eagles quarterback Mike Kafka at Northwestern University. He played the last two seasons in the UFL with the Omaha Nighthawks. The Nighthawks' general manager was Rick Mueller, who is now a player personnel executive with the Eagles. In 2010, he caught passes for the Nighthawks from former Eagles quarterback Jeff Garcia.

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