Buffalo Bills quarterback Thad Lewis has missed practice Wednesday because of sore ribs and is "50-50" to play Sunday against the unbeaten Kansas City Chiefs, coach Doug Marrone says.

Rookie Jeff Tuel and free-agent addition Matt Flynn split the first-team reps. Starting quarterback EJ Manuel remains out for the next game with a knee injury.

The Bills (3-5) have lost three of four in preparing to host the Chiefs (8-0).

Lewis continued playing despite being hurt on the first play from scrimmage in a 35-17 loss at New Orleans on Sunday. Lewis had taken off on a run up the left side, when linebacker David Hawthorne struck the quarterback with a helmet-first hit into the right ribs. Lewis fumbled the ball and had difficulty getting off the field.

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