The UFC did not expand on the issue, or the fighter involved, but said the fight would be rebooked for a later time.
Gregor Gillespie Makes Octagon Return Against Brad Riddell On March 20 - MMA News
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Gregor Gillespie Makes Octagon Return Against Brad Riddell On March 20 - MMA News
Bout between Gregor Gillespie and Brad Riddell PPD due to COVID-19
Brad Riddell vs. Gregor Gillespie Added To March 20 UFC Event
UFC: Brad Riddell ready to showcase talent in clash of styles against star wrestler Gregor Gillespie - NZ Herald
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UFC Vegas 22: Gregor Gillespie vs. Brad Riddell postponed due to COVID-19 protocols - Newsday
Gregor Gillespie vs. Brad Riddell Off UFC Vegas 22