The Cowboys are putting the final touches on their preparation for Sunday's road game at Washington. Dallas will likely be without Pro Bowl right guard Zack Martin because of a concussion. Also, left tackle Brandon Knight is expected to be out two weeks after knee surgery. Dallas is second in the NFC East although with a 2-and-4 record and a half-game behind the Eagles. Washington is 1-and-5 and has lost five in a row.
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