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Fairfax Media reported on Thursday that Mr Seselja and Deakin MP Michael Sukkar could be given frontbench positions lost by Turnbull supporters at the election.
The promotions would marginalise conservative figures such as Tasmanian senator Eric Abetz and former defence minister Kevin Andrews, who were dumped from cabinet by Mr Turnbull last year.
Mr Seselja said he was confident the Coalition would secure a narrow majority of seats but would not be drawn on his interest in a promotion.
"There are a lot of talented people in the ministry and a lot of talent on the back benches," he said. "I am not getting ahead of myself here and it is for Malcolm to decide.
"This is a matter for the Prime Minister and a decision he will make once the final votes are counted."
Mr Seselja said the government would likely secure the 76 seats to hold majority government, but remained hopeful extra seats could swing to the Coalition.
"I'm talking with a lot of my government colleagues in other states and those postal votes are heavily favouring us," he said.
"My understanding is that in Ewan Jones' seat of Herbert, there is no swing away from us in postal votes which means that seat will come to us."
Mr Seselja also responded to reports ACT Electoral Commission Phillip Green would consider some of his federal election spending as designed to sway the result of the ACT election to be held in October.
Such a decision would limit the amount of money the Canberra Liberals could spend on their territory campaign, with spending capped at $1 million for major parties.
One roadside billboard pictured ACT Chief Minister Andrew Barr alongside Opposition Leader Bill Shorten, urging voters not to "risk a Labor double whammy".
Another showed ACT senator and former chief minister Katy Gallagher and Shane Rattenbury signing a power-sharing arrangement in 2012 to deliver the tram, urging voters to punish them at the polling booth.
"I think there is a grey area that needs to be sorted out as clearly these ads were aimed at influencing votes for the federal election," Mr Seselja said.
"If [ACT senator] Katy Gallagher can catalogue her achievements as ACT Chief Minister to promote herself, then you should be able to be critical of those policies."
Labor campaign material made reference to Ms Gallagher's ability to secure $190 million in Gonski funding, $288 million in joint funding for the Majura Parkway and funding for hospitals.
"While I was Chief Minister I was proud to deliver major investment in health, education and roads for Canberra," the pamphlet said.
Mr Green has not yet expressed an opinion on whether Ms Gallagher's campaign material was designed to sway the October election.
Ms Gallagher was comfortably returned to the senate at the federal election.
