Joseph Parker is out of his scheduled bout with Dereck Chisora at the O2 Arena in London on Oct. 26, Eddie Hearn has confirmed.
The New Zealander (26-2, 20 KOs) is suffering from illness, Matchroom Boxing promoter Hearn said.
Hearn took to Twitter to announce the development, adding: "We are working on a suitable replacement and will make a further announcement this week."
Due to illness, @joeboxerparker is out of the @DerekWarChisora fight on October 26. We are working on a suitable replacement and will make a further announcement this week #boxing
— Eddie Hearn (@EddieHearn) October 1, 2019
ESPN's Dan Rafael reported on Tuesday Parker had been unable to train for much of the week, and that the New Zealander's team believed the illness was caused by a spider bite.
A source told ESPN Parker was undergoing tests to determine the exact nature of the illness.
Parker last fought in June, defeating Alex Leapai by TKO.
His most notable bouts in Britain have come against Anthony Joshua and Dillian Whyte, both of whom defeated Parker in 2018.
Meanwhile, Britain's Chisora (31-9, 22 KOs) defeated Artur Szpilka by KO in July in his most recent contest.