Thomas was inactive for a game Sunday against the Cincinnati Bengals, the ninth one he's missed because of a sprained left ankle. He was limited in practice last week, and coach Sean Payton waited until Sunday to decide he's not ready to play.
Reserve running back Ladell Betts already had been ruled out because of a neck injury.
Bengals cornerback Brandon Ghee was inactive for a second straight game because of groin injury. Cornerback Johnathan Joseph (ankle) and safety Roy Willams (concussion) returned after missing the last game. Both had been listed as probable.