He got Australia into the 2018 World Cup, but Ange Postecoglou has announced he won't be there himself.

As Patrick Galloway writes for ABC Grandstand, the FFA is now left with the unenviable task of replacing the Socceroos coach.

We asked our readers on ABC News on Messenger if they had any ideas for who Australia should turn to.

We've taken a closer look at some of the more realistic suggestions (sorry to our readers who suggested Sir Alex Ferguson, Zinedine Zidane and *ahem* Jarryd Hayne).

Guus Hiddink, otherwise known as Aussie Guus

By far, this was the most popular suggestion from our readers.

That makes sense, given that during the Dutch manager's previous short stint as Australian coach (2005-2006) Hiddink gave us our best ever World Cup performance, with a run to the final 16 where we were only defeated in extra time by a last-minute penalty to the eventual winners Italy.

Since then, he's been busy with stints at Russia, Turkey and the Netherlands, as well as Premier League club Chelsea.

Would we want him?

Many Socceroos fans still mutter Aussie Guus's name in their restless sleep. Would be the most popular pick on sentimental grounds alone, though his star has faded since he was last with us.

Would we even get him, anyway?

Guus is good for it. There remains a mutual fondness in FFA corridors for the Dutch wonder, and a teary-eyed pinch hit under the Socceroos banner wouldn't be passed up.

Graham Arnold

Sydney FC coach Graham Arnold would surely love another go ( AAP Image: David Moir )

Arnold is an obvious homegrown suggestion, given he's a former Socceroos striker and he's the coach for Sydney FC, the reigning A-League premiers and champions who this week won the FFA Cup.

The 54-year-old briefly managed the Socceroos in 2006 and 2007 after serving as Hiddink's assistant.

Would we want him?

Graham Arnold's brief tenure as Socceroos coach (appointed seemingly at the last minute prior to the 2007 Asian Cup) sullied his reputation as an international manager, but he's come on leaps and bounds since. Currently holds all three domestic trophies with Sydney FC, so he's got the nous.

Would we even get him, anyway?

The pull would be huge and it may make things awkward for the Sky Blues in the A-League, but Arnold would surely love another go as national boss, at a World Cup no less.

Tony Popovic

Popovic won the Asian Champions League as coach. ( AAP Image: Dean Lewins )

Tony Popovic is another Aussie contender, having made 58 appearances for the Socceroos and more than 100 for English club Crystal Palace, where he later became assistant manager.

He was the first ever coach for the Western Sydney Wanderers, who made consecutive grand final appearances in their first two seasons in 2013 and 2014.

Under him, the Wanderers became the first A-League team to win the Asian Champions League in 2014.

Would we want him?

Popovic's suitability for the role was perfectly encapsulated by his incredible Asian Champions League win with the Wanderers. Has proven he can hit the ground running with small fish to make them a genuine force.

Would we even get him, anyway?

Would depend on how fluid the situation is at his current employer, Turkish club Karabukspor. After the club's board was sacked, his job could be on the line. But Popovic was very keen on managing in Europe, so perhaps just a short-term spell at a World Cup would suit him.

Sam Allardyce, or Big Sam

Sam Allardyce didn't last long as England manager. ( AP Photo: Scott Heppell, file photo )

The Englishman has had tenures at a host of big clubs in his own country including West Ham, Sunderland and Crystal Palace.

His career peaked when he became the manager for the English national team in 2016, but he was only in the job for one game (and 67 days) due to controversial comments he made during an undercover newspaper sting.

Would we want him?

There is absolutely nothing glamorous about anything the former one-match-for-England manager brings to the table. But, if you're the type of punter who thought Ange's tactics were far too idealistic against the likes of Spain, Germany, Brazil et al, then Allardyce is the man to put your money on.

Would we even get him, anyway?

Allardyce is part of an English managing cartel who always parachute into the same circle of crisis clubs in the top tiers of English football, so it would take something sizeable to tempt him to the other end of the world (or Russia).

Harry Redknapp

He was manager of English giants Tottenham Hotspur, where he spent four successful years before being sacked in 2012, and was once a favourite to become England manager.

However, many Socceroos fans will know him as the former coach of Jordan at the time when Australia flogged them 5-1 during World Cup qualification in 2016.

Most recently, the English manager was sacked by Birmingham City after a winless run.

Would we want him?

If you love a good, crusty English geezer with a side-order of top-notch banter and extra servings of wheeling and dealing, look no further than Harry Redknapp.

Would we even get him, anyway?

Recently managed Jordan, so has a taste for international football, and has connections with the Central Coast Mariners. But his hatred for flying loose passes on the training pitch, which Australia would offer aplenty, could see him blow his top.

John Aloisi

John Aloisi is the man who got us into the 2006 World Cup ... as a player ( AAP: Dan Peled )

As a Socceroo he's best remembered for scoring the famous decisive shootout penalty against Uruguay which got Australia into the 2006 World Cup.

He also played in the Premier League, La Liga and Serie A, as well as the A-League.

His coaching career got off to a poor start in 2012 with Melbourne City (then Melbourne Heart), but since 2015 he's experienced some success with Brisbane Roar, who have twice reached the semi-finals under his leadership.

Would we want him?

If Simon Hill's "YEEEEEAAAAAARRRRSSSSSS" over the commentary waves doesn't get you going, then Uruguay-conquering Aloisi maybe isn't the man for you.

Has done OK at the struggling Brisbane Roar, but is far down the pecking order behind Arnold, Popovic and even Kevin Muscat.

Would we even get him, anyway?

Things are pretty grim at the Roar, so any chance to jump a sinking ship to manage at a World Cup would be sorely tempting.

Tony Pulis

Pulis is yet another English manager who might be available — in his case, after being sacked as West Bromwich Albion coach just days ago.

Would we want him?

Like Allardyce, the baseball-cap-wearing Welshman isn't fond of that namby-pamby pretty football, preferring a physical contest and letting the opposition know his players are up for a scuffle.

If you're a masochist who revels in the idea of the Socceroos imitating a rugby team, Pulis is your guy.

Would we even get him, anyway?

Having recently been sacked by West Bromwich Albion, he'd probably be up for an international gig. But there will most likely be some English club offering him a decent pay packet at some stage this season.