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.
The two men meet in a 12-round contest under boxing rules on Saturday.
McGregor is widely seen as a massive underdog against undefeated former welterweight king Mayweather.
World Boxing Organisation (WBO) Asia Pacific super middleweight champion Vijender Singh on Monday placed his weight behind the undefeated Floyd…
“(He) didn't quit once, didn't quit twice, quit three times!” said Mayweather.
The McGregor-Mayweather superfight is scheduled for 26 August 2017 in Las Vegas.
