Carl Froch's promoter has called for Joe Calzaghe's camp to clarify an offer of a fight against the WBO super middleweight champion later this year.
Froch is confident of becoming the first man to beat Calzaghe
Mick Hennessy says Calzaghe's promoter, Frank Warren, has offered Froch a shot at the title in July or September.
Hennessy claims the offer includes giving Warren options on Froch's future fights - a claim denied by Warren.
"There is little point in us discussing the offer until we know their position for certain," said Hennessy.
"Once they have stated in writing, as requested, that they do not require options, we can look at the possibility seriously.
"They have stated that the offer was their last, but I am confident that through on-going dialogue we could come to an arrangement that reflects the magnitude of this fight."
I am still very hopeful that this contest can happen
Carl Froch's promoter Mick Hennessy
Unbeaten British and Commonwealth super middleweight champion Froch is ranked third by the WBO and second by the WBC.
The 29-year-old from Nottingham has been calling out Calzaghe for the past year, confident of ending the Welshman's 10-year reign as WBO champion.
Hennessy says his "very generous offer" to stage the fight has already been turned down, but maintains he is prepared for Froch to fight on a bill promoted by Warren's Sport Network company.
Calzaghe, 35, has set his sights on challenging WBC and WBO middleweight champion Jermain Taylor, but the American has rejected an initial $4m offer, demanding the purse rise to $10m.
And negotiations to fight former four-weight title holder Roy Jones Jr have also collapsed over money.
Hennessy said: "I am happy to continue negotiations for Carl to box on a Sports Network event, but need to know they won't require an involvement in Carl's career after the fight if he wins.
"Given Frank Warren's apparent confidence in Calzaghe, it would be a contradiction if they did."
He added: "This contest could be one of the biggest in British Boxing history. Calzaghe already holds the record for the highest indoor attendance [in Europe], but it would be blown away if he met Carl Froch.
"I see Jermain Taylor has turned a big offer down. There now isn't a bigger viable fight out there for Calzaghe, so I'm hopeful his team will be realistic going forward.
"In light of their rejection, I have also asked what terms would be acceptable to Joe Calzaghe to defend against Carl on one of our shows.
"I am still very hopeful that this contest can happen, regardless of whose event it is on."