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But Reid stood by Castillo and all of his coaches.

“The coaches will stay intact, but we have to thoroughly evaluate everything,” Reid said. “Listen, I think Juan is doing some good things. If you ask the same question about myself and the other coaches and the players, there are some good things that we’re doing and a lot of things we need to work on. I’m telling you it’s not one person. It’s all of us pulling this thing together and doing our jobs together.”

The Eagles overhauled their defense in the offseason, starting with the firing of coordinator Sean McDermott. They made four significant acquisitions: cornerbacks Nnamdi Asomugha and Dominique Rodgers-Cromartie, defensive end Jason Babin and defensive tackle Cullen Jenkins. Babin and Jenkins are plying well. But Asomugha hardly looks like the two-time All-Pro who received $60 million in free agency. Perhaps he’s uncomfortable playing in a system that requires him to play zone at times instead of man-to-man coverage, which he excelled at.

“Our issue right now is we are unable to close out games,” Asomugha said. “We have to be able to close out games. You can’t come into that last quarter and not be able to pull it out, especially when you’re winning.”

The Eagles head to Buffalo (3-1) next week to play the surprising Bills. They don’t play another home game until Oct. 30 against Dallas.

By then, it could be a lost season.

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Notes: DE Trent Cole (right calf strain) and LT Jason Peters (left hamstring strain) both are uncertain to play against the Bills. Reid called both injuries “fairly significant.” … DT Antonio Dixon tore his triceps and needs surgery that will likely end his season. … DE Juqua Parker (high ankle sprain) and DE Darryl Tapp (pectoral strain) are making progressing, Reid said.