Abel Sanchez, best known as the trainer for IBF, IBO, WBA, WBC middleweight champion Gennady Golovkin, disagrees with the Nevada State Athletic Commission sanctioning Floyd Mayweather vs. Conor McGregor as an official boxing match.

Last month at the T-Mobile Arena in Las Vegas, Mayweather snapped a two year retirement to fight McGregor, a UFC champion with zero experience as a pro boxer.

McGregor started well in the first few rounds, but he was eventually broken down and then stopped in the tenth.

According to Mayweather's father and head trainer, Floyd Mayweather Sr. - his son barely trained for McGregor.

After the fight, the 40 year old Mayweather announced his retirement from the sport. The victory also allowed Mayweather to walk away with a perfect 50-0 record - surpassing the 49-0 unbeaten streak of heavyweight legend Rocky Marciano.

If Mayweather indeed retires off this fight, Sanchez believes his legacy will take a hit and few historians will recognize the win as "50."

"As important as it is for him to be ‘TBE’ and as important as it is for him to be recognized as one of the best, I’m surprised that he made this fight. I understand the financial part of it for him, but it does nothing for his legacy and I think for us to consider that being one of the 50 fights would be bad for his legacy and to his image," Sanchez said to On The Ropes Boxing Radio.

"If he retires and does nothing after that, I don’t think that it will be something that will be considered as breaking the record of Marciano. It’s just like when these baseball players were caught using performance enhancing drugs, how can you put those records on file and consider them with the records of the guys that didn’t? I think of this talk about an asterisk besides their name for this being done while using the performance enhancing drug.

"For Mayweather fighting an amateur, it shouldn’t be considered as his 50th win. What he does after this fight will determine how he’s viewed at the end of his career."