'Becoming a boxer' will no doubt consist of fighting a one-off exhibition against a guy paid to lose - see Freddie Flintoff's brief foray into the ring. Fair play to Rio, though. Top bloke - yes, I am a United fan.
Why won't Mayweather fight him? He is a big name opponent with a 0-0 record, he already fought one like that. This would be even more legit than the McGregor farce since Ferdinand is at least big, so that makes up for his McGregor-esque non existing boxing skills.
when mcgregor made his foray into boxing, he at least came from a martial arts background the only fighting rio's ever done was on a woman http://lmgtfy.com/?q=rio+ferdinand