Boyd (concussion) was limited at practice Thursday, Geoff Hobson of the Bengals' official site reports.

As was fellow receiver Tee Higgins (hamstring), which sets the stage for Friday's practice to determine whether each of the duo approach Sunday's game against the Ravens with injury designations or cleared to play. If one or both end up out or limited this weekend, Alex Erickson would be in line for added work Week 17.

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