I do not know where to look this up.
What is A-league?
Do you mean the A-Team?
He could be talking about The A-League.
However, since he is from Australia, I doubt it. Likely, he is talking about The Hyundai A-League, Australia’s professional soccer league.
Did not realise there was another one.
It’s the remnant of the old American Soccer League, which has actually been around longer than our current “first division” league, MLS.
I spent a couple years being a stadium announcer for a team that was in the A-League. Fun times. 
Can anyone in Melbourne help?
Dude, are you kidding? There are a gazillion places where you could see this on a giant screen. Go to any sports bar. Arcadia in South Yarra (corner Punt and Toorak Rds) would be one place. They have a freakin’ enormous screen and would have it on. Pretty much any pub with Fox signs outside will do ya.