McGregor,the two-time champion who garnered international fame during his time with the UFC, will join the cast of the 1989 action remake under the helm of director Doug Liman and producer Joel Silver.
This is not the first time McGregor has decided to quit fighting as he had earlier tweeted twice about retirement, both times when he was involved in arguments with the UFC.
McGregor later in a tweet thanked Tyson and said that he will beat Mayweather in their second bout.
The 52-year-old boxing icon was in Mumbai to promote Kumite 1, a MMA event.
Jeff Horn will defend his WBO welterweight title against England's Gary Corcoran in December.
Singer-actress Demi Lovato sang the national anthem for a packed house at the Floyd Mayweather-Conor McGregor fight at the Las…
For a change, a fight that lived up to its hype!
"It's like a tennis player trying to play badminton," Khan said.
If pay-per-view targets are met, Mayweather could earn as much as $200 million.
The 50th bout of Mayweather's 21-year professional career has been largely been disparaged.
