Manny Pacquiao has urged the WBO to review an "unfair decision and officiating" in his controversial defeat by Jeff Horn.

The former welterweight champion was unanimously outpointed in Brisbane on Sunday as his 29-year-old opponent won his first world title.

Pacquiao cited a request by the Philippines' Games and Amusements Board to WBO president Francisco Valcarcel for a thorough review of the refereeing and judging of the bout, which was staged outdoors in front of more than 51,000 fans at the Suncorp Stadium.

The WBO should take action on the request "so as not to erode the people's interest in boxing," the 11-time champion is quoted as saying by ESPN.

"I had already accepted the decision, but as a leader and, at the same time, fighter, I have the moral obligation to uphold sportsmanship, truth and fairness in the eyes of the public.

"I love boxing, and I don't want to see it dying because of unfair decision and officiating."

Pacquiao had a rematch clause in the contract, meaning that the 38-year-old Filipino could negotiate to fight Horn again before the end of the year.