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Cook (illness) was back on the field for practice Thursday, Alaina Getzenberg of ESPN.com reports.

Cook sat out Wednesday's session, but the running back's return to the field a day later seemingly has him on a path to being available Saturday against the Chargers. Later Thursday, the Bills will post their final Week 16 injury report, which will reveal whether Cook carries a questionable tag into Saturday's contest or if he avoids a designation entirely.

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