Mikkel Kessler's camp says a Joe Calzaghe bout to unify the 168lb division could happen by February.
Kessler holds the WBA and WBC super middleweight belts
Promoter Betina Palle told BBC Sport that negotiations have been initiated with Calzaghe's backer Frank Warren.
While the Dane would prefer the fight in Copenhagen, he is willing to travel for the right price, with Cardiff's Millennium Stadium a likely venue.
But Palle stressed that talks were at an early stage, with the IBF, WBO, WBA and WBC all needing to be contacted.
I don't know why Joe continues to call out Roy Jones Jr, Hopkins and these other guys
Wales' WBO and IBF super middleweight champion Calzaghe, 34, holds a proud record of 42-0 (31 KOs), and - having held the WBO belt since 1997 and made 19 defences - is the longest-reigning current world champion in the sport.
Copenhagen's Kessler, 27, is also undefeated, with a record of 38-0 (29 KOs) since turning professional in 1998.
'The Viking Warrior' stopped Manny Siaca for the WBA belt in 2004 and went on to defend successfully against Anthony Mundine and Eric Lucas.
Last Saturday - while Calzaghe was labouring to victory over Sakio Bika - Kessler stopped Markus Beyer in the third round to add the WBC belt to his collection.
Calzaghe has targeted a bout against a fighter who is well-established with the US TV audience, with Bernard Hopkins his preferred option.
Calzaghe has no doubts he is number one at 168lbs
But 41-year-old Hopkins is officially retired and has shown no signs of reversing this decision to meet the Welshman, who remains a nearly-man across the Atlantic.
"I don't know why Joe continues to call out Roy Jones Jr, Hopkins and these other guys," said Kessler, who many would see as a far more dangerous opponent than the ageing US stars.
"I believe I am the best super middleweight in the world. Joe disagrees with me, fine, but let's settle it where it should be settled - in the boxing ring.
"He should want what the fans want, which is that he and I get it on. Joe knows in his heart he cannot beat me."
Calzaghe predicted Kessler's easy win over Beyer and rates the Dane as the second-best super middleweight in the world, but is confident of victory if the promoters make the match.