New Prime Minister Julia Gillard is not attending the forum in Vanuatu and reports are that Foreign Minister Stephen Smith isn't either.
Mr McCully said he spoke to Mr Smith just recently about his plans but said he would leave it to the minister to confirm his plans.
Australia is the current chair of the forum - a position that goes to whoever last hosts the meeting of Pacific Island leaders.
"They are the chair but they are also having elections," Mr McCully told NZPA.
"I am aware they are intending to be represented and I am quite sure they are giving it all of the thought that they should. The forum is certainly something that is important to them which is why they've discussed it with us."
Earlier this month, Ms Gillard called an election for August 21 and the parties are in campaign mode. Ms Gillard called the election just three weeks after she rolled Kevin Rudd for the leadership of the Labor Party and became prime minister as a result.
Mr McCully said the elections did constrain who could be sent but that did not show a relegation of importance of the meeting.
"They are constrained by their domestic politics as to what they can contribute, they are still keen to work with us to make sure the forum is successful and they've made their own arrangements to be represented."
Prime Minister John Key would attend the forum from August 3 to 6.
