Cox was helped off the field during Thursday's minicamp practice after sustaining a left knee injury, Joe Person of The Charlotte Observer reports.
The Panthers likely won't have a clear idea regarding the extent of Cox's injury until he's sent in for further evaluation. The 23-year-old appeared in seven games as an undrafted rookie in 2017, logging six tackles and a fumble recovery.
Cox was called up for insurance on the defensive line, as veteran defensive end Julius Peppers (shoulder) was a late addition to the injury report Saturday. The rookie could potentially see some rotational reps should Peppers ultimately be ruled out.
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