Zack Martin's apparent calf injury could keep him out about three weeks -- Dr. Matt Provencher

Dallas Cowboys star offensive guard, Zack Martin, went down in the first half on Thanksgiving Day against the Washington Football Team with an apparent calf injury. He was the second Dallas offensive lineman to exit the game on Thursday. Former New England Patriots head physician, Dr. Matt Provencher, breaks down how long he could be out.

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