The Panthers waived Plummer on Tuesday, Joe Person of The Athletic reports.
The undrafted rookie out of Louisville had a strong preseason finale against the Bills, going 21 of 29 passing for 278 yards (9.6 YPA) and two touchdowns, but it wasn't enough to win a job behind Bryce Young and Andy Dalton. Carolina may try to sneak Plummer through waivers and onto the practice squad.