Indigenous boxer Damien Hooper has apologised after breaching Olympic rules for wearing a T-shirt featuring the Aboriginal flag into his first London fight.

The 20-year-old from Queensland wore the shirt as he walked into the ring for his bout against America's Marcus Browne.

Hooper won the round of 32 fight 13-11 and said afterwards that the shirt inspired him.

AOC spokesman Damian Kelly says Hooper has apologised and will not be wearing the flag shirt again in London.

He says the IOC will be looking into the incident in due course.

"The Australian Olympic Committee is certainly counselling Damien and he has already agreed that he will not be wearing that shirt again during this competition," Kelly said.

"He was very remorseful afterwards in regards to the interest it has caused. He was not aware of the damage or the potential damage that could cause by wearing the shirt.

"He apologised to the team and he vowed not to wear the shirt again."

It is understood the flag shirt breaches rule 50 of the Olympic charter.

The rule bans demonstrations or political, religious or racial propaganda at any Olympic sites, venues or other areas.

"I was not really thinking about any fallout," Hooper said after.

"I was thinking about my family and all that. It made my whole performance better."

Cathy Freeman carried the Australian flag and the Aboriginal flag after she won gold at the Sydney Olympics.

The Aboriginal flag was flown at a number of locations during the 2000 Games after the IOC waived its rule against flags of nations not competing.

Hooper's next opponent will be Russia's Egor Mekhontcev.

Damien Hooper (left) came from behind to defeat American fighter Marcus Browne. ( Reuters: Murad Sezer )

"The Russian is more tidy (than Browne) and more experienced," Hooper said.

"If I leave myself out there in the next bout he will catch me.

"I haven't fought him before but he is a quality fighter.

"He has never fought anyone like me. I think I can win a gold medal."

Graham Cheney won Australia's last Olympic boxing medal (silver) in Seoul in 1988.

No Australian has won gold in the ring.

Desperation stakes

Hooper was the first Indigenous boxer to triumph at a junior world title level when he won Youth Olympics gold in 2010.

The world number two-ranked light heavyweight is no stranger to controversy.

He is fortunate to be at the Games after being sent home last month from the team's Canberra training camp over a series of behavioural breaches involving coaches and team members.

But in his first fight in London, Hooper trailed 6-5 five heading into the final round but landed enough scoring blows to claim victory.

"I felt awesome. He was a good opponent as well. He wasn't gonna let me just walk over him," Hooper said.

"I could see it in his eyes and body language that he didn't want to be there.

"In the final round I was down a point and was a bit desperate."