Joe Joyce will face Joseph Parker in a heavyweight contest on 24 September in Manchester.
Parker and Joyce appeared set to fight in July, the fight even announced, before talks broke down.
But with the fight now agreed Joyce said he believed one more win will secure him a world title shot.
“Parker realized he had nowhere else to go and eventually had to take this fight,” Joyce said. “The winner goes on to fight for the world title.”
Joyce is ranked number one by the WBO and number two by the WBC. The winner could be announced as a mandatory challenger for the heavyweight WBO world title which is currently held by Oleksandr Usyk – the Ukrainian facing Anthony Joshua later this month.
“It’s going to be a cracking fight and you will see why he tried so hard to avoid me,” Joyce added of the bout with Parker.
Parker, 30, is a former holder of the WBO title and has just two defeats on his record.
I have waited patiently to get this fight on and let me tell you now, the Juggernaut’s journey ends right here. He has nowhere to run.”
How was Joyce v Parker rescued from the ‘dead’?
The announcement comes as a shock to boxing fans after weeks of stalled negotiations between Parker and Joyce and their respective teams.
Parker had penciled in to fight Joyce this summer on BT Sport after agreeing to the bout in April. The fight was even announced during Tyson Fury’s heavyweight clash with Dillian Whyte on 23 April.
There was a face-to-face backstage ahead of a July bout, but no contract was officially signed.
Parker then asked for a delay and would go on to sign for rival promoter Boxxer, which is tied to Sky Sports.
Joyce’s promoter Frank Warren described the match-up as ‘dead’ as recently as July, citing there would no chance of a joint-broadcast. However, it now seems a deal has now been agreed behind the scenes.
BT Sport will broadcast the event, which could produce the next challenger to Usyk’s heavyweight titles.
Usyk defends his WBO, IBF and WBA (Super) belts against Joshua on 20 August and if he wins may be ordered by the WBO to fight the winner of Joyce v Parker.