Prime Minister-elect Tony Abbott is expected to announce his leadership team tomorrow, with Sophie Mirabella and Ian Macdonald set to be moved to the backbench.
It is understood the new ministry could be sworn in as early as Tuesday, and Mr Abbott has said there will not be too much change to his frontbench.
However, he has to replace Ms Mirabella, who has given she could lose her seat in the .
Ms Mirabella was the Coalition's spokeswoman on innovation, industry and science for nearly four years.
Mr Abbott is also expected to thin the ranks of senators in the leadership team.
Senator Ian MacDonald, who has served as shadow parliamentary secretary in the areas of defence and Northern Australia, says he will not be on the frontbench.
"What should have been one of the proudest days of my life has turned into one of the worst," he said in a statement released on Sunday night.
"The ecstasy of a new government and success in the North has turned a little sad with a phone call from Tony Abbott saying he has no room for me in the new ministry.
"So many people have placed so much faith in me over the last three years ... I feel I have let you all down. There is nothing else I think I could have done to make sure Tony Abbott was elected Prime Minister of Australia and I am proud of that.
"But I do commit myself to working from the back bench to continue the fight for all those things I hold dear."
Deputy Liberal leader Julie Bishop has indicated she is likely to be the only woman in cabinet.
"In time I expect to see many more women promoted," she told Channel Ten.
Meanwhile, Anthony Albanese and Bill Shorten have been campaigning for the Labor Party's leadership.
Under Labor's new rules, , with each given equal weight of 50 per cent.
So far only , though no other candidates are expected to put themselves forward.
Mr Shorten is pledging to spend a lot of time outside Canberra if he wins.
"Because that's where Australia's really happening," he told Channel Seven.
Mr Albanese, who is tipped to win the most grassroots votes, says the contest is about policy vision and who is best placed to lead Labor through a tough time.
"We've suffered a defeat, we had a primary vote which was much lower than what we need if we're going to win," he told Sky News.
While the pair are currently the only contenders, Joel Fitzgibbon, a long-time Kevin Rudd loyalist, .
"Kevin Rudd's allowed to have leadership ambitions, as long as he doesn't have any intention to destabilise the party," he told Insiders.
"Now I don't think he does have leadership ambitions, you'd have to ask him, but if he does good on him."
Labor officials will meet tomorrow to discuss exactly who will be eligible to vote in the leadership ballot.