Fury has not stepped into the ring since fighting Wladimir Klitschko in November 2015.
Irishman could be tested by the Ultimate Fighting Championship or the United States Anti-doping Agency.
While Tyson enjoyed the press conferences, he believes the eventual fight will be disappointing.
The two combat stars will face each other in a little over a month on 26 August.
Saunders is willing to bet his life that Mayweather will finish McGregor within five rounds.
The odds were notably lowered after the world tour.
Former WBO welterweight champion Jessie Vargas made the claim that McGregor was knocked out.
"Money" could join Michael Jordan and Tiger Woods in earning over a billion dollars from their respective sports.
The last press conference is set to take place on Friday (14 July) in London.
The next press conference will take place on Thursday (13 July) in Brooklyn, New York.
McGregor had his microphone cut off while he was trying to retort to Mayweather's speech.
The two stared down for the first time in LA to kick off their promotional world tour.
The UFC superstar and undefeated boxing king meet in Las Vegas on 26 August.
The first of four major press conferences takes place in Los Angeles.
Meet the men brought in to help the UFC champion hone is boxing skills.
London will be one of many stops in the duo's world tour of press conferences.
Many who watched the fight believe Pacquiao should have won.
Defeat to Jeff Horn should be the Filipino's final bout, says coach Freddie Roach.
Many believed they were watching a different fight.
Bellew told Hearn of his desire to fight Ward just moments after the American defeated Sergey Kovalev.