Tyrann Mathieu suffers head injury during tackle in Kansas City Chiefs game vs. Buffalo Bills
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Tyrann Mathieu is out with concussion for Chiefs vs. Bills
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Chiefs' Tyrann Mathieu suffers concussion on opening drive vs. Bills
Kansas City's Tyrann Mathieu out after opening-drive collision with Buffalo's Josh Allen - The Boston Globe
Bills took a lead with 13 seconds left and still lost to Chiefs and the amazing Patrick Mahomes