Carolina is facing the prospect of having to sign another quarterback before this week's game against Atlanta.
Coach John Fox says David Carr suffered a concussion late in Sunday's loss to Tennessee and his status for the game with the Falcons is uncertain.
Backup Vinny Testaverde was already nursing an Achilles' tendon problem and original starter Jake Delhomme is done for the season due to an elbow injury. That leaves undrafted rookie Matt Moore as the Panthers' only healthy QB. He was 2-of-5 for 36 yards and an interception against the Titans after replacing Carr.