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ORCHARD PARK, N.Y. (AP) - Bills quarterback Thad Lewis missed his second straight practice on Thursday and remains questionable for Sunday's game against the Kansas City Chiefs.

Bills coach Doug Marrone reiterated Lewis has a "50-50" chance of playing after bruising his ribs in Sunday's loss to New Orleans.

If Lewis is unable to play, the Bills (3-5) will start either undrafted rookie Jeff Tuel or newly signed free-agent Matt Flynn against Kansas City (8-0). Marrone declined to say Thursday who will start if Lewis can't play.

Lewis has gone 1-2 as a starter since replacing rookie EJ Manuel, who is sidelined with a knee injury.

Marrone expects running back C.J. Spiller to return after missing Sunday's game with a high ankle sprain. Spiller was limited at practice Thursday.