The announcement was made during the UFC broadcast that Giles was preparing to walk to the cage when he suddenly passed out.
The Nevada State Athletic Commission immediately made the call to cancel the fight with Giles receiving medical attention after fainting.
A video shown backstage showed Giles awake and alert as he was sitting in a chair speaking to medical personnel with his coaches nearby.
This is the second matchup scrapped from the UFC Vegas 5 card on fight night after a light heavyweight fight between Gerald Meerschaert and Ed Herman was also pulled at the last minute after Meerschaert tested positive for COVID-19.
This article was originally published on www.mmafighting.com