Last month, eight division champion Manny Pacquiao sparked outrage by saying gay people are "worse than animals."
The 37-year-old, who is running for a seat in the country's senate, made the remarks on a television program broadcast by Filipino station TV5.
Campaigning to secure one of 12 national seats he said: "It's common sense. Will you see any animals where male is to male and female is to female?
"The animals are better. They know how to distinguish male from female. If we approve [of] male on male, female on female, then man is worse than animals."
He first clarified his comments on his Instagram page, before later posting a video message on his Twitter account.
"I'm sorry for everyone who got hurt due to my comparison of gay people (homosexuals) to animals," he said."It was my mistake. Please forgive me for those who I've hurt. "But this does not change my position against same sex marriage. That's what I believe. My only mistake is comparing gay people to animals."
The first fighter to win world titles at eight different weight divisions, Pacquiao is set to retire after his trilogy bout with Timothy Bradley on April 9th.
The Filipino boxer's "super fight"in Las Vegas with Floyd Mayweather last year was the most lucrative in boxing history. Pacquiao lost a unanimous points decision.
HBO, who are carrying the Pacquiao-Bradley pay-per-view, have stayed quiet during the controversy - until now. The next has issued a statement on the matter.
HBO Statement regarding the recent comments made by Manny Pacquiao:
“Next month Manny Pacquiao and Timothy Bradley Jr. are scheduled to meet in a Pay-Per-View bout. We have an obligation to both fighters and, therefore, will proceed to produce and distribute that event. However, we felt it important to leave no uncertainty about our position on Mr. Pacquiao's recent comments toward the LGBTQ community. We consider them insensitive, offensive and deplorable. HBO has been a proud home to many LGBTQ stories and couldn't approach this event without clearly voicing our opinion."
