Cahill was among 32 players picked in an expanded training squad, announced by coach Bert van Marwijk on Monday, but the veteran forward faces an anxious wait before knowing whether he will make the final cut for Russian Federation.
The 38-year-old Cahill is Australia's all-time leading scorer with 50 from 105 internationals, but he has struggled for form and match time in recent months.
His addition to the squad leaves homegrown defenders, such as Josh Risdon and Bailey Wright, scrambling for a place when the squad is culled to 26 players next week.
The defender is eligible to represent Australia due to the fact his father was born Australia. He is a very good striker.
Australia coach Bert van Marwijk has suggested that soccer take a lead from tennis on the use of technology in the game in the wake of the Video Assistant Referee (VAR) debacle at the Australian championship game last weekend.
"I understand that there will be change and that (it) is also in the (World Cup) but I don't think that we don't discuss anymore situations when we have a video referee". Arzani, the highly rated 19-year-old, earned his first call-up to the national team on the back of his captivating performances in the A-League.
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Arzani, who is regarded as one of Australia's brightest young prospects after helping Melbourne City win the A-League, also made the provisional squad. Tim Cahill's early exit from Melbourne City has paid off as he'll be included for his fourth World Cup. Karacic holds an Australian passport, although he's never actually visited the country before.
The 26-man squad van Marwijk named for the March friendlies against Norway and Colombia was retained for the preliminary World Cup group, including captain Mile Jedinak and warhorse Tim Cahill. "Now I have a lot of information", Van Marwijk said.
"He is already the captain of his team, at 21-years-old".
"The problem is we don't have a lot of choices for the right back position", van Marwijk said.
Striker Jamie McLaren's recent goal-scoring exploits in Scotland won him a recall alongside goalkeeper Mitchell Langerak, Alex Gersbach and Apostolos Giannou.
"Nobody told me not to nominate him because of this, but I hope that when we are nominating him he will play for Australia", he said.
Australia face France, Denmark and Peru in Group C. They will play friendlies against Czech Republic and Hungary before their curtain-raiser in Russian Federation.