CANBERRA - Australia's opposition leader Peter Dutton has said that his conservative Coalition can still win Saturday's general elections despite opinion polls projecting a victory for the governing Labor Party.

Dutton said on Tuesday that internal polling undertaken by the Coalition is more positive than publicly-released polls, and Coalition volunteers at early voting centers across Australia have received "a lot of good feedback".

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The Australian Electoral Commission said on Tuesday that 3.23 million of Australia's 18 million registered voters had cast their mandatory ballots at early voting centers as of Monday and that an additional 776,196 had returned postal ballots.

Despite Labor's lead, some polls have found that it is still a possibility that neither major party wins a clear majority of the 150 seats in the lower house of parliament where the government is formed.

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In such an eventuality, known as a hung parliament, both Labor and the Coalition will enter negotiations with minor parties and independents for their support to form a minority government.