Mayfield (ankle) didn't participate in Friday's practice, Darin Gantt of the Panthers' official site reports.
Earlier this week, Mayfield was spotted around practice sporting a walking boot, but he shed the boot Friday, according to Gantt. At this stage, the quarterback hasn't been ruled out for Sunday's game against the Rams, but it's still unlikely that he starts. The Panthers' upcoming injury report will add further context with regard to Mayfield's chances of being in uniform this weekend, but it he's unable to play, P.J. Walker would draw the starting assignment.