June 14-20 marks Refugee Week while Australia's second game of the tournament, against co-hosts the United States in Seattle at 5am Saturday AEST, coincides with World Refugee Day.
Of the 26-man Socceroos squad, four are former refugees: Mabil, Nestory Irankunda, Mohamed Toure and Milos Degenek.
Mabil was born in Kakuma refugee camp in Kenya to South Sudanese parents before his family settled in Adelaide when he was 10.
"We have many refugees in the team and ... we all belong to this world together," the 30-year-old said on Tuesday (local time).
"So we've all just got to thank Australia and do our very best for the country that has taken in so many refugees over the years and has done that for a long time, and now we're representing Australia, from our background.
"I have a story of there was war in my country, so my parents fled my country, and then Australia took us in through a humanitarian visa - so that's how I was able to go to Australia.
"Many others have their way of going to Australia, and their reasons.
"It's Refugee Week and it's a week that I would like to say to anybody that is misplaced all over the world: we are with you and we are in a world stage right now in a big tournament, and just to tell you everything is possible - so keep going."
The Socceroos made waves on the eve of the tournament with a video organised by the players' union, Professional Footballers Australia.
The players spoke about their diverse backgrounds and how they reflected modern Australia, while saying "football is for everyone".
That includes six players of African descent, one of Tamil background, Nishan Velupillay, and players with heritage from across Europe.
At a time in Australia when anti-immigration sentiment is on the rise, the video has gone viral and received a widely positive reception.
"It was a moment to describe what Australia is - and Australia is a very multicultural country, and that's what makes it the best country in the world, in my opinion," Mabil said.
"It's the best country in the world because of that: you have the whole world in one place and the Socceroos now is a representation of that - you have many different backgrounds representing one jersey.
"So for me it was an easy thing to do. And as players, also, we all have different stories, and it all came together.
"The reason why it went viral is because it was raw, it was not edited.
"It was just purely what the players wanted to say and all put together, and then it had an effect, because individually the Australians can feel and relate with it."
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