Calzaghe is set for a return to Vegas to fight Jones jnr
Roy Jones Jr insists he will fight unbeaten Joe Calzaghe at light-heavyweight this autumn.
The veteran American legend claims he and Welsh two-weight world champion Calzaghe will clash on 20 September, probably at The MGM Grand in Las Vegas.
"Me and Joe are going to fight this fall and right now it's looking like 20 September," Jones told the Sun.
BBC Sport understands Calzaghe's stay at light-heavyweight means he will give up his WBC super-middleweight title.
Calzaghe could be succeeded as WBC champion by another British fighter Carl Froch who is expected to face American Jermain Taylor for the vacant title.
Calzaghe, 36, and Jones, 39, are set to co-promote their showdown which could be the final fight for both greats.
Calzaghe split with long-time promoter Frank Warren earlier this week and Jones said: "I am free and he is free and this will be the first time in a very long time that two fighters sat down and ironed out all the details themselves.
"We didn't want nobody like Golden Boy, or Frank Warren or Don King involved and we're fortunate enough to get this done our way."
Calzaghe defeated Bernard Hopkins in Las Vegas earlier this year and is set to return to the Nevada desert to face Jones, another American boxing superstar, in a big-money show.
The 20 September date was initially set aside for the Floyd Mayweather Jr and Oscar De La Hoya rematch but it became available when Mayweather retired three weeks ago.
The Calzaghe camp, however, have told BBC Sport they are unaware that a confirmed date has been finalised.
Calzaghe is the king of the super-middleweight division - holding the WBC, WBA and WBO titles - but also holds The Ring light-heavyweight crown he won by beating Hopkins on points.
And the Welshman, unbeaten in 45 fights, will put that belt on the line when he takes on four-weight world champion Jones in Vegas.
Calzaghe has set his sights on fighting Jones after turning down a chance to fight fellow unbeaten star Kelly Pavlik, the WBC and WBO middleweight champion.
He told BBC Sport last week: "What a perfect way to finish, fighting one of the greats of this generation in what I expect will be my final fight before retirement.
"Not many fighters know to bow out at the right time, too many go on and on - it'll be the fight of my life."