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Tennessee head coach Brian Callahan hasn't expressed optimism about Spears' (concussion) likelihood of suiting up Sunday versus Houston, Jim Wyatt of the Titans' official site reports.

Spears worked as the Titans' lead back this past Sunday versus Jacksonville but was forced to exit the game late in the third quarter. He'd need to clear the NFL's five-step concussion protocol in order to suit up Week 18, and that may be unlikely to happen at this point. Tony Pollard (ankle/illness) could return for the season finale, but if both Spears and Pollard are out, Julius Chestnut and Joshua Kelley likely will be tasked with leading the Titans backfield.

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