Former heavyweight world titleholder is out of his scheduled bout with Dereck Chisora at the O2 Arena in London on Oct. 26, FightNights.com has learned.
Parker (26-2, 20 KO’s), 27, of New Zealand, has been unable to train for much of the week after he was reportedly bitten by a spider.
He won the vacant WBO heavyweight title with a controversial majority decision over now-unified champ Andy Ruiz Jr. in December 2016. He made two unconvincing defenses before losing to then-unified titleholder Anthony Joshua on points in March 2018.
Since dropping a unanimous decision to Dillian Whyte last July, Parker has picked up back-to-back knockouts against the likes of Alexander Flores and former title challenger Alex Leapai.
Last month, Parker-Chisora was nearly called off over drug testing.
David Higgins, who manages Parker, threatened to pull his boxer from the bout unless Chisora agreed to undergo World Anti-Doping Agency (WADA) drug testing.
Britain's Chisora (31-9, 22 KO’s) knocked out former world title challenger Artur Szpilka in July in his most recent bout.