The 33-year-old, who enjoyed a perfect 22-fight record as a professional between 2011 and 2017, is now competing in the amateur ranks.

He wanted to enter the final Olympic qualifier for Tokyo 2020 which was due to be held in Paris in June, but the event was scrapped in February.

It means places at the Games will be assigned according to the world rankings instead and Tso, who has only fought sporadically since leaving professional boxing, does not have a high enough position.

In March last year he entered the Asian qualifier in Amman in Jordan but lost in the featherweight quarter-finals to Uzbekistan's reigning world champion Mirazizbek Mirzakhalilov. 

"There was supposed to be one last chance but the world qualifying event has been cancelled and that prevented me from trying one last time," said Tso, according to the South China Morning Post.

"Of course, it's a bit disappointing. 

"If I tried and lost, that's fine. 

"But this is not the case.

"I really want to go to the Olympic Games which is my biggest dream and if my physical ability and other conditions allow it, I may have another go at the Paris Olympics.

"Of course it is still too early to say at this moment but the Olympic Games will always remain my top priority."

No Hong Kong boxers have competed at the Olympics since Lee Kam Wah and Law Hon Pak fought at the 1964 Games in Tokyo.

Tso, who is nicknamed The Wonder Kid, could also compete at the Hangzhou 2022 Asian Games on his journey to Paris.

"I want to focus on representing Hong Kong at the multi-sport Games and I am in no rush to return to professional boxing," he said.

"But training has been seriously affected by the pandemic as I can only stay in Hong Kong with no competition at all, and my last bout was the Olympic qualifiers in Jordan some 14 months ago. 

"But I am using this time to improve and fine-tune some of my skills so that I can be a better and stronger boxer when the competition resumes."

Tso's professional career saw him win various regional titles at super flyweight, and he was ranked in the top 10 by all four of the leading professional boxing organisations.