Source: Palmer to sit out Thursday

Cincinnati Bengals quarterback Carson Palmer, who has been nursing a sprained ankle since Aug. 14, will not play in Cincinnati's preseason finale against the Colts on Thursday but will play in the team's regular-season opener against Denver, a source said.

In the past 24 hours, Palmer has made his most significant strides, according to those in Cincinnati. He has taken legitimate snaps from center, avoided the rush and moved in a way that proves he is sufficiently recovered from his ankle sprain.

He will continue to do everything but play in Thursday night's game.

He took snaps with the starting offense on Tuesday for the first time since he got hurt.

"He looked remarkably improved," coach Marvin Lewis told reporters on Tuesday. "He looked pretty good. He was moving better."

When Palmer reported to the Bengals' training facility Wednesday morning, he told people it was the best he's felt.

Still, Cincinnati plans to hold him out Thursday night -- and absolutely play him against Denver.

Adam Schefter is ESPN's NFL Insider. Information from The Associated Press was used in this report.