Tyson Fury has backed Mike Tyson and Evander Holyfield to return to the ring - as long as they fight each other.
The former heavyweight world champions have recently returned to training, despite having a combined age of 110.
Tyson has hinted he will announce his comeback opponent this week with Holyfield among the contenders.
Former UFC stars Wanderlei Silva and Victor Ortiz have also claimed they have been offered the fight, while Shannon Briggs is another in the frame.
And Fury, who is waiting for a date for his trilogy fight against Deontay Wilder, said: "I think everyone to their own thing, if that's what makes them tick and gives them a goal then I'm all for it.
"I know what it's like not to have a goal, to sit on the sidelines and watch everyone else and be a has-been.
"I know what it's like to set a goal and set about achieving it; if they want to do this, it's their choice, let them do it.
"If they pass medicals and brain scans and they're healthy to box, let them box."
Tyson and Holyfield are expected to fight in exhibition fights for charity rather than in professional bouts.
And Fury added: "George Foreman was 44 when he won the world heavyweight championship.
"If they fight exhibitions between them and people their own age, I wouldn't like to see Mike fight one of the top heavyweights, it's just not fair.
"But to see him fight an old timer of his own age its fantastic, I'll buy the pay-per-view."
