Australia is in need of a victory against already eliminated Peru in Sochi if the Socceroo's are to have any chance of reaching the round of sixteen for only the second ever time. To his credit, van Marwijk has so far done that, but most Socceroos-watchers haven't.
Peru striker Jefferson Farfan will miss the game as he recovers in hospital from "head trauma" as a result of a training-ground collision.
Serendipity played a part in Van Marwijk's appointment, given that he was available to take over after walking away from Saudi Arabia over contractual disagreements despite guiding the Green Falcons to Russian Federation.
Australia played France tight in its opener, but succumbed to a 2-1 loss before tying Denmark 1-1.
"We deserved more ... it was just a pity the way it all panned out for us ... we just couldn't hit the back of the net", he said.
It was their first win in nine games at the tournament since they defeated Iran 4-1 in Argentina in 1978, and they will now hope to build on their performances in Russian Federation after finally coming in from the global wilderness.
"In my opinion we are unlucky because the first goal was offside and the second goal was a very lucky goal, so we didn't have the luck in all three games".
Australia coach Van Marwijk admits the struggle to score goals - they registered only two Mile Jedinak penalties in Russian Federation - was their downfall.
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With one game left for each team, France has earned a spot in the knockout round and either Denmark or Australia will be joining them.
Australia were already two goals down, and heading for the exit, by the time Cahill was introduced.
The goal was against the run of play and incredibly simple, with captain Guerrero - who was perhaps marginally offside - controlling a long ball before crossing for the unguarded Carillo to thrash home on the volley.
The talismanic Guerrero, 34, made his mark on the game's biggest stage with his 36th worldwide goal early in the second half, extending his record as the country's all-time leading scorer.
So it was a cruel twist of fate that his goal would be the one that effectively ended Australia's chances of progressing to the last 16.
The 34-year-old was set to miss the World Cup having been given a 14-month ban after testing positive for a cocaine by-product contained in a tea.
On came Cahill and Arzani, but despite throwing bodies forward and controlling play, the under-pressure Socceroos had to settle for a series of half-chances.
Back at the World Cup for the first time since 1982, Peru isn't leaving Russian Federation empty handed. Sochi was just the final chapter.