Anthony Joshua and Tyson Fury have reached an agreement in principle to fight on two separate occasions.
Between them, AJ and the Gypsy King hold all four heavyweight titles and speculation about a fight between the duo has been growing since Tyson Fury defeated Deontay Wilder in February.
Already, questions have been raised about venues, dates and a queue of other heavyweight challengers – here’s everything we know so far.
Has a contract been signed?
Not yet – a deal has merely been agreed in principle between the two camps.
Promoter Eddie Hearn told Sky Sports on June 10: "Joshua and Fury have agreed to a two-fight deal, in essence.”
One of Fury’s promoters Frank Warren added: "Things are going in the right direction and we couldn't be more happy that a potential mega fight is in reach."
Fury himself took to Instagram to say: "The biggest fight in British boxing history has just been agreed. Two-fight deal. Tyson Fury versus Anthony Joshua next year."
When will the fight happen?
Tyson Fury’s Instagram post indicates that a fight would take place in 2021.
Joshua would first need to defeat Kubrat Pulev before a fight between the duo takes place, which could be delayed for some time due to the ongoing coronavirus pandemic.
Where will the fight happen?
Despite both fighters hailing from England, a showdown in the UK is unlikely.
Hearn admitted that while he would love the bout to be staged in Britain, financial practicalities make it much more likely that it will take place in the Middle East or China.
Speaking on Matchroom's Youtube channel, Hearn said: "If we can do the fight in the UK, fantastic, (but) we know Saudi Arabia would love to have this fight - we had a wonderful experience last time with the Andy Ruiz fight.
"We've had offers from China, we've had offers from around the world. This is the biggest fight in boxing - it doesn't get any bigger. There's not going to be any country that stages major events that won't want this fight."
Are there any other obstacles?
A fair few.
Joshua needs to overcome Pulev first but Oleksandr Usyk lies in wait as the WBO's mandatory challenger.
However, an undisputed title fight means that could be put back.
Complicating matters on Fury's side is Dillian Whyte, who has indicated he would not be willing to wait for a title shot the WBC has said he must receive before the end of February next year.
Fury also must face Deontay Wilder for a third occasion but with Wilder currently convalescing after bicep surgery, Fury-Whyte could take place before then.