Adrian Segečić switches from Australia to Croatia ahead of FIFA World Cup

One of Australia's brightest young talents appears to have been lost without even playing a game for the Socceroos, with Portsmouth dynamo Adrian Segecic switching associations to Croatia.

Less than three months out from Australia's World Cup opener in Vancouver, Segečić's switch went through on Friday and was visible on FIFA's change of association platform on Saturday.

Under FIFA rules, once Segečić is fielded in a match by Croatia, he is unable to switch back to Australia.

If Segečić does not play for Croatia and wanted to backflip on his decision, he would need to submit a request for change of association to FIFA's Football Tribunal.

The 21-year-old played for Australia at under-17, under-20 and under-23 levels and received his first senior call-up under Tony Popovic for September's window against New Zealand.

But the former Sydney FC youngster didn't play a minute across those two games and hasn't been called up since.

Segečić, who has scored six goals and notched two assists across all competitions since joining English Championship club Portsmouth, had previously said on multiple occasions he wanted to play for the Socceroos at the world cup.

That has clearly changed.

Segečić follows in the footsteps of Canberra-born and Australian-raised Josip Simunic, who opted to play for Croatia over Australia in 2001.

It is unclear how soon Segečić could line-up for his country of choice, given the talent available to world number 11 Croatia, who have friendlies against Colombia and Brazil this month.

The attacker follows midfielder Nectar Triantis (Greece) in attending a Socceroos camp, then switching nationalities. Triantis has since debuted for Greece.

Segečić's decision is a blow to Australia's attacking stocks ahead of their world cup campaign and before warm-up friendlies against Cameroon and Curacao in his hometown of Sydney, then Melbourne, this month.

Popovic has, on multiple occasions, made it clear he won't be "selling" the Socceroos shirt to players eligible to play for multiple countries.

While Alex Robertson has committed to Australia, the Socceroos are still awaiting a decision from Italy youth international Cristian Volpato.

The 22-year-old knocked back Graham Arnold's approaches ahead of the 2022 World Cup.

But Volpato has warmed to the idea of playing for Australia and met with Popovic and assistant Paul Okon in Italy last month.

"We're not selling the shirt," Popovic said.

"There were no ultimatums or any pressure — it was a discussion — and if he wants to play for Australia, whether that's, let's say, three months, six months, a year … they're young men, you have to respect the decisions they have to make.

"He's indicated he's open to the idea, now the rest is just for him to decide."

AAP