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American referee Mark Geiger checks the VAR screen during the Russia 2018 World Cup Group F football match between South Korea and Germany at the Kazan Arena in Kazan on June 27, 2018. (Photo by Luis Acosta / AFP) / RESTRICTED TO EDITORIAL USE - NO MOBILE PUSH ALERTS/DOWNLOADS (Photo credit should read LUIS ACOSTA/AFP/Getty Images)

American referee Mark Geiger checks the VAR screen during the Russia 2018 World Cup Group F football match between South Korea and Germany at the Kazan Arena in Kazan on June 27, 2018. (Photo by Luis Acosta / AFP) / RESTRICTED TO EDITORIAL USE - NO MOBILE PUSH ALERTS/DOWNLOADS        (Photo credit should read LUIS ACOSTA/AFP/Getty Images)