The duo are looking to have their boxing fight take place in August.
Jones Jr also revealed that he is still on board with the idea of boxing UFC legend Anderson Silva.
Reports from the Los Angeles Times had suggested that UFC president was not involved in current negotiations.
UFC president Dana White not involved in talks over cross-code clash.
Avtandil Khurtsidze indicted under the Rico Act, law reserved for top organised crime kingpins.
The UFC heavyweight champion had previously spoken of his interest in a boxing fight with Joshua.
Joshua had been due to make a mandatory title defence against Kubrat Pulev.
The Matchroom promoter expects a full decision with Klitschko camp to be met this week.
The highly anticipated bout was already confirmed to take place on 16 September.
But former world champion boxer hopes UFC superstar can "splatter" Mayweather.
Golden Boy chief recently called on fans to help protect boxing from a potential fight he dubbed a "circus".
Ultimate Fighting Championship president rules out working with "scumbag" Top Rank chief Bob Arum.
Mayweather says he and McGregor have a task to give the fans the excitement they are expecting.
"The Special One" took a knee in the 11th round at Bramall Lane on Saturday night.
Del La Hoya says the sport of boxing may not recover from the proposed super fight.
Legendary fighter believes prospective cross-code bout would not be one to entertain the purists.
British heavyweight superstar hoping to swerve WBA and IBF mandatory challengers.
American boxer really "looking forward" to signing deal to fight the UFC superstar.
Joshua says a fight between the two will "go down in history".
Mayweather also gave an update on when he could fight next.