An assistant referee keeled over and fainted in the first half of Peru's Copa América Group A match against Canada, being played in hot and humid conditions at Children's Mercy Park in Kansas City on Tuesday.
Humberto Panjoj collapsed during stoppage time in the first half, with Canada goalkeeper Maxime Crépeau attracting the attention of medical staff.
The Guatemalan official was treated on the sidelines and briefly got back on his feet before being taken off on a stretcher.
According to AccuWeather, the temperature in Kansas City is expected to reach a high of 93 degrees Fahrenheit on Tuesday, with a humidity of 53%.
Canada went onto win the game 1-0 with a second-half goal from Jonathan David after Peru had been reduced to 10 men following a red card for Miguel Araujo.