Former world champion Anthony Mundine has slammed fellow Australian boxer Jeff Horn, saying the Queenslander only gets attention because of his skin color.

Speaking to News Corp Australia, Mundine, who was hoping to fight Horn this year before the 29-year-old elected to head to the United States for his next bout, described him as the 'flavor of the month'.

"He's only the flavor of the month because he is a white boy, just like Danny Green was the white boy," Mundine, who also called for Australia Day to be moved from January 26, told The Daily Telegraph.

"You've just got to look at society - whites get privileges. I don't care if you're white, black, brown, whatever, it's your heart that makes you," Mundine said.

"But in the western society, whites get privileges, and because Horn is white, he gets all that attention and media coverage."

Mundine, who has won major titles in three weight divisions since switching from rugby league in 2000, will on Wednesday look for a first win since November 2014, after losing successive fights for the first time in his career.

Speaking ahead of his clash with Tommy Browne at the Star in Sydney for the vacant WBO middleweight title, the 42-year-old says he is in the best shape since his first fight with arch-rival Danny Green in 2006.

A win on Wednesday would likely earn Mundine (47-8, 27 KOs) a WBO world ranking.

Browne (35-6-2, 13 KOs) lost featherweight world title fights to In-Jin Chi and Chris John back in 2005 and has moved up through the divisions.

He took a five-year break between 2008 and 2013 and decided to remain in the sport after his younger brother and fellow boxer Davey died of injuries suffered in a bout in late 2015.

The card will also include unbeaten young cruiserweight Jai Opetaia, former NRL star Richie Fa'aoso ,who will make his professional debut as a heavyweight, and Kye Mackenzie who will fight Argentina's Emiliano Garcia for the interim WBO Asia-Pacific lightweight title