Mundine said to reporters on Monday that he is trying to "better Australia" and "educate people" by rejecting the nation's song - to be sung by indigenous performer Jessica Mauboy pre-bout.
But Green says he won't following Choc's lead and is adamant he doesn't have enough "emotional investment" in Mundine to be affected by anything he says.
"I’ll be standing and singing the anthem," Green said.
"If he wants to sit down that’s up to him.
"I don’t have enough of an emotional investment in Anthony Mundine to be affected by anything he says.
"Choc’s an Indigenous man and if he feels so passionately and strongly about the issue then that’s his prerogative, that’s his choice."
The second bout between the two is expected to attract a crowd of more than 25,000 and is likely to shatter Australian pay-per-view records.