Fiji's Immigration Department has confirmed Labor's candidate for Deakin, Shireen Morris, is not a Fijian citizen amid threats to challenge the result if she wins the seat.

Key points: Shireen Morris is of Indian-Fijian heritage, but was born in Australia

Shireen Morris is of Indian-Fijian heritage, but was born in Australia The Herald Sun reported this week Dr Morris may be a dual citizen

The Herald Sun reported this week Dr Morris may be a dual citizen Fijian authorities said although her father was a Fiji citizen at the time of her birth, Ms Morris was never registered as a Fiji citizen

Dr Morris, who is of Fijian-Indian descent but was born in Australia, is running against Liberal MP Michael Sukkar in the Victorian seat in the May 18 election.

The Herald Sun reported this week the Coalition had legal advice she had been a Fijian citizen since birth.

But Fiji's Immigration Department confirmed Dr Morris was never a Fijian citizen.

"Our citizenship records have confirmed that Ms Shireen Morris is not a Fijian citizen," a department spokesperson said in a statement to the ABC.

"She was born in Australia and holds Australian citizenship."

Ms Shireen's mother was born in Fiji and her father was born in India.

"Even though her father was a Fiji citizen at the time of her birth, Ms Morris was never registered as a Fiji citizen," the spokesperson said.

Fiji's Immigration Department director Nemani Vuniwaqa told the ABC's Pacific Beat program anyone born to Fijian parents overseas had to register to become a Fijian citizen.

"All children of Fiji citizens born out of the country have to go through the process to apply for citizenship," he told the ABC.

"The current law says they will go through the registration process in order for them to be a citizen."

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A Labor spokesperson said: "We welcome the Fijian Immigration Department putting this matter to bed."

"There was never any evidence to support the Liberal Party's baseless smear campaign which dishonestly claimed Shireen carries Fijian citizenship — such claims were ludicrous," they said.

The Coalition had reportedly raised the possibility Dr Morris may be ineligible for election, with Prime Minister Scott Morrison quoted as saying there "may well be issues".

Dr Morris's situation had been compared to that of Islamic state recruiter Neil Prakash, who had been stripped of his Australian citizenship after the Government's own advice claimed he was a Fijian citizen.

"The Coalition doesn't have any right to make claims about Shireen Morris's citizenship or anyone else's citizenship for that matter," according to Helen Irving who specialises in Australian constitutional law at the University of Sydney.

"If Fiji says Shireen Morris is not a citizen, then Australia doesn't have the right to declare that she is."

"It's entirely a matter for the country in question to determine whether a person is a citizen of that country or not, that's the principle of international law," Professor Irving said

The ABC has contacted the Coalition for a response.