Australia face Sri Lanka at The Oval on Monday needing a win to stand any chance of progressing into the semi-finals of the ICC Champions Trophy.
All four teams could still go through from Group A, with New Zealand and England playing on Sunday.
Australian skipper Michael Clarke has trained with his side after sitting out the first two group games with a back injury, but head coach Mickey Arthur admits the weather could play a part in deciding the outcome of Group A.
Arthur, whose side's last clash with New Zealand was a no-result because of the rain, told Sky Sports News: "I just hope that rain doesn't play a significant part in the end of this Champions Trophy because it's been a real good competition so far and it would be a shame if we had two games rained out in a competition.
"It serves us right, we should have won the first game (against England)."
Arthur knows it will be tough against a Sri Lanka side which put England to the sword last time out.
"You talk about the big three in the batting - Dilshan, Jayawardene, Sangakkara - you talk about Malinga with the ball, but Sri Lanka have built up a really nice unit.
"We know we've got to be really on our money. We know we can't obviously take anybody lightly, we've got to again prepare the best we can and come out and put in the performance that hopefully takes us to a semi-final."
Sri Lanka lost to New Zealand narrowly in their opening clash before beating the hosts and Tillakaratne Dilshan believes the settled side can beat anyone on their day.
He said: "We played the same team last couple of months. We beat Australia (twice) in Australia (drawing a five match ODI series 2-2 in January), we played very good cricket here last year.
"I think we are playing very good cricket. If we click the way we want in all three departments, we can beat any side in any conditions."