It is believed the South Australian government agreed to throw in millions to secure the event.

About 40,000 people are expected to attend the spectacle next February at the renovated venue.

The pair last met in 2006 in front of an Australian record crowd of 30,000 at Sydney’s Allianz Stadium.

Mundine won the super-middleweight bout via a unanimous points decision.

“The first rule of fight club is we don’t talk about fight club, but no one told the (Adelaide Advertiser) because they’ve leaked it,” said Leon Bignell, South Australia’s sports minister, in an interview with 5AA radio.

“They’ve put it on the front page and I can confirm that Anthony Mundine and Danny Green will be in Adelaide today. We’ll hold a press conference where we’ll confirm that they’ll take part in a grudge match.

“The only time they fought was in 2006. They hate each other, these two blokes. It’s genuine. It’s not confected it all. We’re going to have the biggest fight in Australia’s history - 37,000 people at the Adelaide Oval on a balmy summer night. It will be a terrific spectacle that will be televised around the world and attract about 10,000 fans into Adelaide.”

The pair will walk away with about $10 million each.