Running back Cadillac Williams was held out of Thursday's practice with back spasms, and is listed as probable for Sunday's game at Atlanta. While players listed as probable usually play, the fact that the back spasms have returned is a concern for the Bucs.

Williams experienced back spasms in last Sunday's loss to the Ravens, something that contributed to his lack of carries (he carried eight times). Williams is coming off a brilliant rookie season that was marred by a persistent foot injury that sidelined him for two games and limited him significantly in portions of other games.

He's one of the toughest guys who I've met and, obviously, this is not something that's just gone away here overnight like we had hoped," coach Jon Gruden said Thursday. "Hopefully he gets a good night's sleep and a day's rest helps him."

Also added to the injury list Thursday: cornerback Brian Kelly, who is probable with a sore foot.

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