UFC officials announced the change during the event's preliminary card, with UFC commentator citing a "non-COVID, non weight-cutting illness on the Derrick lewis side."
It's currently unclear if the bout will be rescheduled.
Lewis (26-10 MMA, 17-8 UFC), currently sitting at No. 7 in the UFC's official heavyweight rankings, had been looking to snap a disappointing two-fight skid after suffering back-to-back losses to Sergei Pavlovich and Tai Tuivasa.
This story first published at SI.com/MMA.