CHARLOTTE, N.C. -- Panthers quarterback Cam Newton was not present for the start of practice because of a concussion.
The league's reigning MVP did not attend the first 20 minutes of practice on Wednesday that were open to reporters, three days after he suffered a concussion in a 48-33 loss to the Atlanta Falcons.
Newton was placed in the league's concussion protocol after taking a hit from Falcons linebacker Deion Jones in the fourth quarter.
The struggling Panthers (1-3) host the Tampa Bay Buccaneers on Monday night.
If Newton doesn't play, Derek Anderson would start for Carolina.
Left tackle Michael Oher, who missed the Falcons game with a concussion, was not at practice either.
Carolina's starting right tackle Mike Remmers and running back Jonathan Stewart worked on the side with trainers.