Eight-division world champion Manny Pacquiao said he feels "vindicated" after reports went out that Floyd Mayweather Jr. illegally administered to himself an intravenous substance the day before their May 2nd "Fight of the Century."

Pacquiao texted fellow Filipino reporter Abac Cordero of the Philippine Star that "truth finally came out and I was vindicated," as reported by Rappler. "Mayweather camp used to accused (sic) me of using PED. Now, look at what happened. I hope Floyd Mayweather would learn a good lesson out of it."

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Merely three days before Mayweather's fight versus unheralded opponent Andre Berto, an SB Nation article that questioned the pound-for-pound king's performance-enhancing drug practices was published, casting more doubts over the results of Mayweather and Pacquiao's bout last May. 

ESPN's Dan Rafael noted that the ingredients of the IV substance were actually not banned, but the intravenous administration itself was illegal according to the World Anti-Doping Agency (WADA) guidelines.

Rafael also noted that Mayweather applied and received the exemption to take the substance intravenously from the United States Anti-Doping Agency (USADA) three weeks after the match, something that is noticeably wrong in terms of timing.

According to the SB Nation writeup, Nevada State Athletic Commission chief Bob Bennett said that USADA is not entitled to grant waivers and exemptions to boxers because they are only "a drug-testing agency," reiterating that it was only the commission that is allowed to provide such absolutions.

USADA denied their fault on Thursday by issuing a statement that Mayweather's application for exemption was legally done.

Mayweather also released his own statement reminding everybody that he is the one who pursued "more drug testing and awareness" to ensure boxers are "clean" when they fight.

Top Rank boss Bob Arum was reportedly "outraged" by the report, saying that the news was "very disturbing."

"I am outraged, but I don't know what we can do about it," said Arum. "I can't change the result (of the Mayweather-Pacquiao's fight), but this sure does upset me. Especially with Manny not being allowed his perfectly legal injection."

It should also be noted that while Mayweather got his IV's on the eve of the fight, Pacquiao was not allowed to take the "perfectly legal" substance called Toradol to help with his shoulder pain, citing the timeliness of the request as the basis of the commission's decision.

TagsBoxing, Boxing 2015, Boxing News, Boxing News 2015, Boxing Rumors, Boxing Rumors 2015, manny pacquiao, Floyd Mayweather Jr