Joe Calzaghe could add a third belt to his collection after WBC champion Markus Beyer expressed his interest in a unification bout later this year.
Beyer wants a crack at 33-year-old Calzaghe's two world titles
Beyer, 34, is keen to fight Calzaghe, who destroyed American Jeff Lacy on 5 March to add the IBF super middleweight title to his WBO crown.
"A fight against Calzaghe, with three titles at stake, is a tremendous challenge," said the German.
"Those unification fights are very attractive and it is one of my goals."
In his last two fights, "Boom Boom" Beyer scored a unanimous points verdict over former Calzaghe opponent Omar Sheika, before clinching a 12th-round stoppage of Italian challenger Alberto Colajanni in January.
Beyer is scheduled to make a further defence of his title on 13 May and his promoter Wilfrid Sauerland revealed he had received an offer from Calzaghe's representative Frank Warren.
"We are very interested in this fight and are happy that England is interested as well," Sauerland said.
"But their current offer is not acceptable. It is not good enough financially and the date coincides with the football World Cup.
"But we are in talks and would love to stage this attractive bout in either September or October."
Sauerland's comments come less than six weeks after he claimed he "would not do any business with Frank Warren any more".
The row started after both managers had repeatedly failed to work out unification fights between Calzaghe and German former WBA/IBF champion Sven Ottke.