Australia has won a tug-of-war for the 20-year-old Hrustic, who was also courted by Bosnia and Herzegovina, his father's native country.

Hrustic has been included in the Socceroos' 23-man squad for their massive month of June which features a crucial FIFA World Cup qualifier, a friendly against Brazil and the Confederations Cup in Russia.

Postecoglou said he didn't hassle the Melbourne-born Hrustic to commit to Australia.

"I don't try and convince them and I don't try and put pressure on them," Postecoglou told reporters in Adelaide on Wednesday.

"We offer them an opportunity ... if in the meantime we lock them in to be an Australian international, that is great.

"But it has to come with a willingness on their part to take the opportunity."

Postecoglou said Hrustic, who left Australia for Europe as a young teen and broke into Dutch side Groningen this season, had impressed at a recent Olyroos camp.

"He is one that looks like he has the potential to hopefully one day become a regular international," he said.

Hrustic is one of three uncapped players in Postecoglou's squad alongside Sydney FC goalkeeper Danny Vokovic and Adelaide United defender Dylan McGowan, who recently signed for Portugues side outfit Paços Ferreira, joining brother Ryan in the squad.

But others, including Robbie Kruse, were fortunate to make the squad, whose first commitment is a World Cup qualifier against Saudi Arabia next Thursday in Adelaide.

Kruse has been included despite being without a club and only playing four times in 2017.

Postecoglou said the 28-year-old was at the crossroads after moving to China this season after four years in Germany.

"With Krusey, obviously the China move didn't work out for him," he said.

"He is probably one where his next move is going to be very, very important.

"And again he gets a little bit of an opportunity to put himself in the shop window.

"I rate Krusey highly. He is still at an age where at his best he can certainly contribute at international level.

"But he is probably one of the ones who is fortunate to be in the squad."

The seven players cut from the squad were Rhyan Grant, Alex Gersbach, Craig Goodwin, Jimmy Jeggo, Mustafa Amini, Riley McGree and Mark Birighitti.

Goodwin and Amini have been omitted despite both playing integral roles in helping their sides, Sparta Rotterdam and AGF respectively, escape relegation.

Another surprising omission is Jeggo, who has been a regular starter for Strum Graz in the Austrian Bundesliga as they finished third and qualified for the Europa League next season.

Meanwhile, Grant was an integral part of Sydney FC's record breaking A-League season, including scoring the crucial equalising goal in the grand final against Melbourne Victory.

FULL SQUAD:

Goalkeepers: Mat Ryan (Genk, Belgium), Mitchell Langerak (Stuttgart, Germany), Danny Vukovic (Sydney FC)

Defenders: Milos Degenek (Yokohama, Japan), Trent Sainsbury (Inter Milan, Italy), Bailey Wright (Bristol City, England), Brad Smith (Bournemouth, England), Aziz Behich (Bursaspor, Turkey), Dylan McGowan (Pacos de Ferreira, Portugal), Ryan McGowan (Guizhou Zhicheng, China)

Midfielders: Mile Jedinak (Aston Villa, England), Mark Milligan (Baniyas, UAE), Jackson Irvine (Burton, England), Aaron Mooy (Huddersfield, England), Massimo Luongo (QPR, England), Tom Rogic (Celtic)

Forwards: Tim Cahill (Melbourne City), Tomi Juric (FC Luzern, Switzerland), Mathew Leckie (Hertha Berlin, Germany), Robbie Kruse (Uncontracted), James Troisi (Melbourne Victory), Jamie Maclaren (Darmstadt, Germany), Ajdin Hrustic (Groningen, Netherlands).