Rookie Matilda fullback Karly Roestbakken's father might be Norwegian – but there is no doubt where his loyalties will lie on Sunday morning.
In the search for any advantage, Australia's experience playing with and against Norwegian players could be one.
Eight Matildas have spent time with clubs in Norway, and a majority of the squad has turned out for a Scandinavian team at some point in their career.
The Matildas also have a Norwegian in their own camp.
Or at least half of one.
Karly Roestbakken's father Jack was born in Norway, where he played semi-professionally, before moving to Australia and coaching his daughter.
The 19-year-old, who made a full debut against Jamaica, dismissed suggestions of divided loyalty.
"No way!" she said.
"My family, they back me 100 per cent. So they might be Norwegian but they're putting on this (Australian) jersey."
Given the nature of Roestbakken's last-minute call-up, as a replacement for stricken defender Laura Alleway, she didn't have any family in the stands for her substitute debut against Brazil.
That changed for the Jamaica win, with Jack arriving in the nick of time.
"It was a bit late notice. He actually arrived (in the) morning, just in time for the game," she said.
"I tell you my Dad's not going to miss (the Norway) game.
"I reckon a few of my relatives might come over as well so we'll see how that goes. It's gonna be an awesome game."
Meanwhile Norway look set to have star striker Caroline Graham Hansen available for their do-or-die clash with the Matildas at the World Cup.
Australia's meeting with the former world champions takes place on Sunday morning (AEST) in Nice.
All 23 Matildas trained a day out from the clash, with Sam Kerr resuming after taking a day off on Thursday to manage workloads.
The biggest question mark is on Hansen, who suffered an ankle injury in Norway's win over South Korea as she was awarded a penalty.
The 24-year-old, Norway's highest-rated forward, trained a day out to ease fears she would miss the clash.
Her creativity could be crucial; the last four goals the world No.12s have scored in France have been penalties or own goals.
Australia coach Ante Milicic should also have a full deck of players to choose from after Clare Polkinghorne and Tameka Yallop missed their 4-1 defeat of Jamaica.
The Norwegians have benefited from an extra day off for the clash; an advantage that Milicic says could "mean a lot".