Albion Park hockey star Casey Eastham says world champions Argentina will face the fittest and strongest Hockeyroos side ever when they begin a three-test series in Perth on Saturday.
London Olympians Jade Close, Kobie McGurk and Jayde Taylor are back to strengthen the squad.
Eastham said a focus on physical conditioning has the Hockeyroos primed to seek revenge on the side that knocked them out of the Olympic medal race in 2012.
"It's been a really tough slog for a lot of the girls leading into this," she said.
"We're trying to create an elite environment that is results driven and rewards people who are all round athletes as well as hockey players.
"It's a bit of a different squad because we've just had a whole heap of standard testing put in place, which means if you don't meet minimum requirements for fitness, speed and strength you don't get selected."
The Hockeyroos took out the World League semi-final tournament in London to qualify for the 2014 World Cup, which has the side high on confidence.
"Going off our last tournament, physically we were the best prepared team there," she said.
"It was the fittest and strongest team we've ever brought away. Going out on that field knowing that we had, athletically, the best group of girls at the tournament gave us an air of confidence.
"Without being cocky we knew there wasn't going to be a team that would challenge us if we played our best."
Facing the Olympic silver medallist will be a step up for the young side ahead of the World League final in November and the 2014 World Cup.
"The Argies are always really tough," she said.
"We didn't face them at World League three [semi-final tournament] so we haven't seen them since the Olympics.
"It's obviously a big game for us seeking a bit of redemption."
"We've got the physical side of things, everyone's 'PBing' in all different areas, so hopefully we can put all that hard work out on the pitch and get the hockey results to back it up."
Eastham said the squad that tackles the World League final and next year's World Cup will form the nucleus of the team at the 2016 Rio Olympics.
"We've lost a few girls since the Olympics but I'd say majority [of the squad] will stay.
"Our side is quite young so 99.5 per cent will go through."
Eastham, a 159-test veteran at just 24, has one foot on the plane to Rio but isn't looking past the World Cup.
"Over the years I've had to start doing a bit more short-term goal-setting," she said.
"My goal is to go to Rio but I'll get through World Cup and the re-assess."
"I'll more than likely have a season over in Holland next year just for bit of a different experience and after that it'll only be a year out [from Olympics] so I daresay I'll be there."