GLENDALE, AZ - DECEMBER 24: NFL referee John Parry #132 watches a replay on a video monitor during a game between the Arizona Cardinals and the New York Giants at University of Phoenix Stadium on December 24, 2017 in Glendale, Arizona. (Photo by Norm Hall/Getty Images)
HOUSTON, TX - DECEMBER 25: Referee Bill Vinovich (52) reviews a play during the game between the Pittsburgh Steelers and Houston Texans on December 25, 2017 at NRG Stadium at Houston, Texas. (Photo by Leslie Plaza Johnson/Icon Sportswire via Getty Images)
ORCHARD PARK, NY - DECEMBER 03: Referee Gene Steratore #114 speaks with Head coach Sean McDermott of the Buffalo Bills during the game against the New England Patriots at New Era Field on December 3, 2017 in Orchard Park, New York. New England defeats Buffalo 23-3. (Photo by Brett Carlsen/Getty Images)
LANDOVER, MD - DECEMBER 24: Referee Ed Hochuli #85 looks on before a game between the Denver Broncos and Washington Redskins at FedExField on December 24, 2017 in Landover, Maryland. (Photo by Patrick McDermott/Getty Images)
SANTA CLARA, CA - DECEMBER 24: Referee Jeff Triplette looks at a reply during the game between the San Francisco 49ers and the Jacksonville Jaguars on December 24, 2017 at Levi's Stadium in Santa Clara, CA (Photo by Samuel Stringer/Icon Sportswire via Getty Images)
