Coach John Fox said today that David Carr sustained a concussion late in Sunday's loss to Tennessee and his status for next week's game against Atlanta is uncertain.

"He's still be evaluated," Fox said. "We'll keep you posted."

Fox also said center Justin Hartwig (broken right thumb), receiver Steve Smith (hip) and defensive end Julius Peppers (toe) were injured against the Titans. None has been ruled out of the Atlanta game.

But the biggest concern for Fox is Carolina's endless troubles at QB. With Carr and Vinny Testaverde (Achilles' tendon) banged up and original starter Jake Delhomme (elbow) out for the season, undrafted rookie Matt Moore is the only healthy QB. It could force Carolina to sign yet another quarterback this week.

"I wouldn't say that's not a possibility," Fox said.

Carr, who missed a game last month with a sore back, started yesterday ahead of Testaverde, who is battling tendinitis in his right Achilles' tendon. Carr struggled against the Titans, completing just 15 of 27 passes for 107 yards, one touchdown and one interception in the 20-7 loss.

Carr, who had trouble finding receivers all day, was sacked seven times. He was knocked out of the game complaining of dizziness after being hit by Titans defensive tackle Tony Brown with 3 minutes left.