Queensland Liberal MP Stuart Robert said their run for the parliamentary positions won't be contested.
"Peter Dutton ... and Sussan Ley will be sworn in by the party room uncontested," he told Nine Network on Monday.
"(I'm) super happy about the party room and the leadership team we're bringing in."
Mr Robert also said he expected there would be more women on the Liberal front bench, following a reshuffle after former ministers lost their seats in the May 21 election.
"We've got so many talented women in our ranks and you'd expect that talent to be recognised and rewarded," he told Sky News.
"So absolutely, I'd expect far more women just because of the calibre of the women in the Liberal and National parties."
The party room will also discuss some of the lessons to be learned from the coalition's federal election defeat.
"The party room is the opportunity for everyone to get together, to have a conversation, to share how things have gone, not just to elect their leadership team," Mr Robert said.
"I'm one of the few MPs who was actually here in 2007 (when the coalition also lost), so the time to provide some guidance on what it means in opposition and how we hold the government to account, that will come later."
Mr Dutton will become the first Queenslander to lead the Liberal Party.
The Dickson MP has been touted as Scott Morrison's likely replacement since the coalition lost government.
NSW Liberal senator Hollie Hughes says Mr Dutton will lead the party back to the centre-right as it looks to rebuild.
Former immigration minister Alex Hawke says the party had a strong history of containing both progressives and conservatives.
"That's a strength not a weakness and I think that blend is very important," he said.
Mr Hawke also denied the party had struck the wrong balance between the two at the election.
"The regions struck very strongly with the Liberal and National parties, the suburbs and outer suburbs ... very strong results in western Sydney," he said.
"We were blindsided in areas of Brisbane, Sydney and Melbourne. Votes that went to the Greens, votes that went to the teals, this is something we have to look at, what policies will appeal to those people."
Former home affairs minister Karen Andrews, also a Queenslander, says the leadership duo will offer the skills and depth needed to take the party forward.
Mr Dutton, a former police officer, spruiked his credentials for the job of opposition leader following his nomination.
"In a prime minister you need someone who won't buckle in hard times and will stand up for our country and I have proven that in the portfolios I've had," he wrote on Facebook.
"My work ethic is second to none and I have the skill and experience having served five leaders and have learnt from each."
Mr Dutton has pledged to take the party back to its core values and represent the aspirational "forgotten people" of Australia.
"We aren't the Moderate Party. We aren't the Conservative Party. We are Liberals," the post said.
The Liberal Party has never had a leader from Queensland since it was founded in 1944.
Elizabeth Watson-Brown, the new Greens MP for the Brisbane-based seat of Ryan, said voters won't be "enamoured" by Mr Dutton.
"The Liberal Party does need to do some soul searching," she told the ABC.
"The general sense was that their campaign was sort of pretty disgraceful, there was a lot of culture-war baiting (and) inaction on climate change," she said.
"The voters of Ryan will not necessarily have a particularly benign view of Peter Dutton."