Anthony Joshua

Parker, the World Boxing Organisation champion, makes his maiden defence against Fury at Auckland's Vector Arena.

NZ Herald reports Joshua, the International Boxing Federation titleholder, and Klitschko, the former IBF, WBO and World Boxing Association champion, fight for the vacant WBA belt at London's Wembley Stadium.

A total of 90,000 tickets are understood to have been sold for the latter fight alongside an expected million pay-per-view passes, courtesy of an exclusive deal with BSkyB. Budgets suggest the fight will generate more than 50 million in revenue.

Klitschko says he will only take the December 10 fight in Manchester if the WBA belt is on the line too.

The WBA and WBO belts have been freed up by Tyson Fury who handed them over to concentrate on his battles with depression and drug use.

Joshua's manager Eddie Hearn said the next 48 hours would be vital as they seek a ruling from the WBA. In the meantime he confirmed he is looking at other options.

Hearn's easiest backup route is to call out Parker who is the mandatory challenger with the IBF.