Carl Froch will defend his IBF and WBA World super middleweight titles against George Groves later this year.
The all-British clash will take place in late November or early December, with a venue set to be confirmed within the coming weeks.
Froch recently added the WBA strap to his IBF belt when he beat Mikkel Kessler in an exhilarating rematch at the O2 Arena in May, while unbeaten Groves collected the vacant WBA Inter-Continental title on the bill with a fifth round stoppage of Noe Gonzalez Alcoba.
"I'm excited the first defence of both my belts is a big domestic clash," said Froch. "I am a proper fighter and a proper champion and I will always face my mandatory challenger rather than vacate the title.
"I've known George for a while, I've sparred with him and watched him grow and now he's my mandatory - I will be pouring everything into my preparation for the fight and George will face the very best of me.
"It is better this way than a low-key overseas opponent as this fight will relight memories of some of the great all-British clashes and with World titles on the line it's a really huge occasion and one that will grab the attention of British sports fans."
Froch is some eleven years Groves' senior and has been performing at the very highest level for a number of years, but the 25 year old Londoner is confident that he has the skills to become the new dominant figure in the super-middleweight division.
"This is the biggest fight of my career and being a World champion is something that I dreamed of as a kid," said Groves.
"I'm well ranked across all the governing bodies but fighting Carl is the one that I wanted the most. He is a big name in the UK and a well-respected champion around the world, and I have a great team around me that can put together the right game plan to beat him and become a World champion and a major force in the super middleweight division."
Eddie Hearn, who represents both fighters, revealed how pleased he was to tie up a deal so quickly after Groves was made the mandatory challenger for Froch's IBF title.
"I'm delighted to have got this fight made," revealed Hearn. "It's a great fight for British boxing with a real throwback feel to the big domestic fights in the super middleweight fights in the 90s.
"When George became the mandatory challenger, I knew there was no way Carl would relinquish the belt and no way that George would look anywhere else.
"This fight will grow and grow and fans can expect an exciting night and a packed undercard when full details of the fight are announced."