The Merseyside club will see firsthand just how much the game has grown when they take on Melbourne Victory in a preseason friendly in July but former Reds star Rush, who had a short stint in Australia over a decade ago, was positive about the state of the sport down under.
"I played here in 2000 with Sydney Olympic so obviously it's got a lot better since I played," he said.
"With the national team doing well, it's a big thing to qualify for the World Cup, yes it has got a lot stronger.
"Just to qualify for the World Cup, for the national team to do that, means that the league is doing well. I know a lot of them (Socceroos players) are over in Europe but it's (the A-League) getting stronger and stronger.
"You just have to look at the fact Manchester United are coming over here (to play the A-League All-Stars) and Liverpool are coming over here, I think it's a good benchmark to see what it's all about, but of course its improving."