Postecoglou fronted the media on Tuesday to announce his final 25-man squad for next month's do-or-die playoff clashes against Honduras.
The coach has been heavily criticised over recent weeks amid speculation he intends to quit his Socceroos post after the Honduras matches regardless of whether Australia qualify for next year's World Cup or not.
On Tuesday, the defiant national team coach was at his evasive best amid persistent questioning in his first press conference since an incendiary report suggested he would walk even if he was successful in leading the Socceroos to Russia next year.
A home-and-away playoff with Honduras next month will decide whether Australia makes it to the 2018 tournament.
And it's only after that will Postecoglou reveal his plans.
"I'm happy to have that discussion when we qualify," he said on Tuesday.
"If we don't qualify ... my future is absolutely certain.
"I'm not going to waste my time thinking about things that might or might not happen."
Postecoglou is contracted to take the Socceroos to the World Cup, but a defeat in the two-legged showdown next month will end his tenure early.
Postecoglou has always maintained he welcomes criticism and he welcomes debate but gave a fascinating insight into how he's coped with the recent barrage when asked on Tuesday what his legacy will be after four years at the helm of the Socceroos.
“I know what my legacy is. It’s never going to be defined by one result. I hope my legacy will be someone who believed in something and followed it through," he said.
“In the last little period I’ve been called ‘Con Postecoglou’ because obviously Con and Ange are easily misinterpreted, both ethnic names. I’ve had my surname twisted in headlines because it’s obviously funny which has taken me back to my primary school days.
“I’ve been called ego-centric, selfish, calls for me to be sacked. But you know what, I’m still here and I still won’t change what I believe. That will be my legacy.
“Some people won’t like that because they don’t like me and the way I do things but others will appreciate that. That’s what my legacy will be, not a result or a performance.
“It doesn’t hurt me but that’s how people want to define me at this moment after 30 years in Australian football.
“If I start changing the way I am because of that sort of stuff, then I do tarnish my legacy. I’m not surprised – I don’t have a problem with criticism.
“Have I ever rung anyone in this room to tell them I’m not happy with an article? I’ve never had any problem with criticism, debate is healthy, I have no issue.
"It’s not what drives me. I was asked what my legacy will be and it’s someone who stuck to their guns and no amount of mud thrown at me will change that.”
Postecoglou refuted suggestions of disloyalty.
"When you coach your country there's no greater honour ... I've done it for 11 years in different capacities. I love this job."