He started the year as an unknown to most Australian fans but some consistent form has seen Bailey Wright become a Socceroo bolter.
Postecoglou unveiled his preliminary 30-man squad in Sydney on Wednesday, with the selection of the little-known defender the biggest surprise.
The 21-year-old Melbourne-born centre-back plays for Preston North End in the third-tier of English football, wasn't considered to even be in contention until just a few weeks ago.
But after impressing Postecoglou during his European scouting mission in February, Wright is now in contention for a spot in Brazil and a new-look Socceroos back-four.
"He's been on our radar for a little while...he's only a young man beginning his career," Postecoglou said of the former Joey's representative who played his junior football with Langwarrin, Mornington and Dandenong Thunder in Melbourne.
"But he has had some really strong consistent form at Preston North End in a team that has done well and is on the verge of promotion to the Championship.
"Particularly playing in his position, we have had some injury clouds over a couple of our centre-backs, so he's one that played almost 50 games this year and is in good, solid form.
"It makes sense to bring him in and have a look at him in a national team environment."
Wright, along with Fortuna Dusseldorf's Ben Halloran, is one of only two players in the squad without a Socceroos cap to their name.
With veteran defenders Lucas Neill and Sasa Ognenovski overlooked, Wright could feature in a revamped defence which is light on for international experience.
There are 10 players selected from the Hyundai A-League, including the likes of Josh Brillante and Adam Taggart, and average age of the squad is under 23.
"Yes there's inexperience but at the same time it's a great opportunity for some of these younger players to forge their own national team careers," Postecoglou said.
"I've been really impressed with a lot of the young guys, particularly Brillante and Taggart in the A-League. Ben Halloran has really come on this season in Germany and these guys are 20, 21 years old.
"On reflection the way Curtis Good handled that step up in the Ecuador game gave me even more confidence that the young players, given the opportunity will take it.
"It's exciting to see them but they've obviously still got to perform in this whole group of 30 to get on the plane...how they perform in the context of this camp will be an indicator as well."
Asked what the public can expect from his youthful side in Brazil, a Bullish Postecoglou said: "Hopefully what they see excites them in the way we play our football and the way we approach these games.
"The footballing public deserves to dream about and want the best for its national team.
"There are over 15,000 Aussies going over to watch the games, the whole nation will watch in the middle of the night and I want them to get up and be excited about watching this team.
"Then our responsibility is to excite them when they watch, give them a glimpse into the future and maybe take them on a bit of a wild ride where the unexpected happens."
The final chance to see the Socceroos on home soil before they head to Brazil 2014 will be when they take on South Africa in a farewell game on May 26 in Sydney. Tickets for the match, presented by NAB, are on sale now. Click here to secure yours today.