Prime Minister Julia Gillard is likely to visit Governor General Quentin Bryce tomorrow to set an August 28 election date, the ABC understands.

According to Labor sources, Ms Gillard is expected to visit Quentin Bryce in Canberra tomorrow morning.

But it is believed that the issuing of the writs will be delayed until next Wednesday to allow more time for people to enrol to vote.

The election campaign will be six weeks long.

Ms Gillard will travel to Brisbane, where there are particular concerns among Labor of a lag in youth enrolment in Queensland, after her visit to Yarralumla.

Ms Gillard has arrived in her electorate of Lalor in Melbourne after earlier visiting Tasmania on a whistlestop tour before the election campaign proper begins.

She has been forced to fend off questions over whether she reneged on a handover deal made with Kevin Rudd the night before he was toppled as Labor leader.

Speaking in Tasmania today, Ms Gillard reaffirmed her earlier statements that there would be a role in Cabinet for Mr Rudd if Labor were re-elected.

"If the Government is re-elected I will choose the ministry. I have said that Kevin Rudd will serve as a senior minister in a re-elected Gillard Government. That is my commitment, I will honour that commitment," she said.

Opposition Leader Tony Abbott has also been on the unofficial campaign this week, visiting electorates in New South Wales and Queensland.

Ms Gillard became Prime Minister just over three weeks ago after ousting Mr Rudd when his support among Caucus collapsed.

After taking on the prime ministership Ms Gillard sought to quell concerns over the legitimacy of her rise to power by promising that she would soon allow voters to go to an election.

She wasted no time defusing the stoush over the contentious mining tax by cutting a deal with the industry in the first week of her prime ministership.

However her efforts to solve the asylum seeker issue went awry after confusion over where a planned regional asylum centre processing centre would be.

Ms Gillard is yet to announce Labor's plans to tackle climate change after the Government shelved its emissions trading scheme earlier this year.

Speculation has been high all this week that Ms Gillard was close to calling an election in order to capitalise on the bounce in the polls for Labor after she was installed as leader.