Michael Clarke is adamant Australia will be leaving nothing in reserve when it takes on Pakistan in two One Day Internationals at the WACA, despite the matches being dead rubbers.
Australia's 40-run win in Adelaide on Tuesday saw the hosts claim the five-match series 3-0 ahead of the two games in Perth on Friday and Sunday.
But the Australian vice-captain said there was plenty to play for as Australia tested its depth ahead of the series against the West Indies by resting regular starters Shane Watson and Doug Bollinger.
"First and foremost you're representing your country," Clarke said on Thursday.
"Every game you play for Australia, it's very important and a big part of that is because you have guys playing state cricket that want an opportunity, so you know you need to keep performing."
"That's the way it's always been since I've played international cricket, there's always somebody up you backside wanting to take your spot," he said.
Clarke warned that maintaining the winning form was particularly vital in the 50-over format, where Australia has claimed 20 of the last 26 games, including series wins in England and India, along with the Champions Trophy.
"I think momentum's a big thing," Clarke said.
"We've just started the summer pretty well here in the one day format so it's really important we continue playing good cricket and take that momentum into the West Indies coming up."
Clarke said any decision regarding Peter Siddle's fitness would be made on Friday ahead of the first game after the Victorian fast bowler missed the third ODI in Adelaide with a back injury.
Having been rested for the first three matches, Mitchell Johnson will come in to the squad for Bollinger as Queensland's James Hopes replaces Watson.
Clarke said any decision on whether Hopes opened or played as a middle-order batsman with Brad Haddin opening, would depend on the conditions on Friday afternoon.
But Clarke backed all the Australian fringe players, like Hopes and bowlers Ryan Harris and Clint McKay to continue performing at this level, saying Australia's domestic system ensured a smooth transition to international level.
But with Cricket Australia looking to made radical changes to the Big Bash series, changing the state-based format to an Indian Premier League style Twenty20 competition built around city-based sides, Clarke offered a gentle warning.
"The strength of Australian cricket since I've played either for New South Wales and Australia has been the first class system being so strong," he said.
"For me, the priority is to make we don't touch that or we don't lose anything from that."
"If things are altered or improved, that's fantastic, but I think the first class system we have, with all three forms of the game, I think is fantastic and that's certainly why we are so strong."