Source: Mike Florio, NBC Sports Pro Football Talk 
As of Wednesday, Bills quarterback Thad Lewis was expected to play, despite injured ribs. That’s what we were told by a source close to the situation, and I believed it. If I didn’t, I wouldn’t have picked the Bills to beat the Chiefs on Sunday.
As of Friday, Lewis officially is doubtful. He could still play; “doubtful” officially means there’s a 25-percent chance he’ll go.