By Miguel Rivera

According to Hall of Fame trainer Ignacio "Nacho" Beristain, the sport of boxing deserves more respect from former world champions Oscar De La Hoya and Manny Pacquiao.

The veteran trainer offered some strong criticism for the retired boxer turned promoter and the eight division world champion turned senator, believing that they are only looking to earn easy money.

Nacho is upset at De La Hoya and Pacquiao for their recent challenges to UFC superstar Conor McGregor, who made his pro boxing debut back in August against Floyd Mayweather.

Nacho was a very big critic of the Mayweather vs. McGregor contest.

Mayweather, 40 years old, came out of retirement and scored a tenth round stoppage of the UFC star.

But McGregor did well enough in the fight that he's able to warrant a few more paydays in the boxing ring.

The fight with Mayweather also did huge business, with a pay-per-view buyrate figure of 4 million - making it the second most successful pay-per-view event in combat sports history.

In the last few weeks, several top boxers have been calling for a fight with McGregor - but the two who made the biggest headlines were De La Hoya and Pacquiao.

Nacho has no idea what's going on with the sport when several big names are calling for McGregor to fight them.

"I would not lend myself to that type of thing, boxing is more serious than people think," Nacho told ESPN Deportes. "I think it's the need to make money, but money is not everything in life. I owe a lot to boxing and one day I'm going to die and I'm going to have to, so I respect the sport a lot.

"An easy way to earn money is fine, but for those of us who love boxing and view it as a serious thing - we are against what is happening."