PHILADELPHIA — The Eagles are 8–4, but they hardly feel like a contender right now.

After a bleak, 24–15 Black Friday loss to the Chicago Bears at Lincoln Financial Field, the Birds are facing a reality they hadn’t confronted all season: a once-promising playoff position is slipping, and the problems holding them back are no longer isolated.

They’re structural — starting with an offense that can’t find answers and a once-formidable defense that just got bullied.

“We’re evaluating everything,” Sirianni said Monday. “You don’t have as much time as you have in a normal bye week, but it’s a mini-bye. We’ll think about some different things that we want to do, all over the place — scheme, everything. But I don’t think it benefits us for me to share, in particular, what that is.

“Just know t

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