De La Hoya was so critical of that fight, that he penned an open letter that was posted to the internet, where the former boxer tried to rally the boxing public to boycott the pay-per-view event.
With McGregor not being a licensed cornerman or fighter in the event, sanctions for his actions lie in the grey area.
Speaking recently with DashRadio, De La Hoya revealed he has been in training for several months and has his sights set on McGregor as his first opponent back from retirement.
"You know I'm competitive".
"... He was a little bit over emotional there, but you sort of understand when you know his and Charlie's relationship over the last number of years". "[My confidence] is how I feel now from my training", De La Hoya said on the radio show.
"I will take out Conor, all I need is two rounds".
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"Tell your boy to bleedin' gear up again and get in and fight me!" I'm calling him out.
"I had some executives from UFC contact me within two hours after what occurred and they basically said to me that it's completely unacceptable in their eyes and that they will be doing something", Mazzulli said (transcribed by Jesse Holland for MMA Mania). That's all I'm going to say.
Guessing that might be some of De La Hoya's motivation in that "secret" training.
The 44 year-old last fought in 2008 when halted by Filipino great Manny Pacquiao but believes McGregor would be taken out should the Irish UFC star accept the offer.
"I don't want to speak for him, but he's in shape and I'm sure he has been thinking about it", Eric Gomez, De La Hoya's best friend since childhood and president of Golden Boy Promotions, told ESPN of a possible comeback. He would freaking destroy me. "It's not all peaches and cream, but life is life and you have to think about the solution of what you have to do to keep walking". But it also made both participants very rich.