Papua New Guinea says it will deport an Australian barrister who was ejected from the Manus Island detention centre despite a court order granting him access.

Sydney barrister Jay Williams is representing 75 asylum seekers and was granted access to the facility by Papua New Guinea judge Justice David Cannings.

However, Mr Williams was ejected from the detention centre yesterday.

PNG's attorney-general Kerenga Kua says Mr Williams is not legally allowed to practise as a lawyer in PNG.

He says Mr Williams never applied to the National Court for permission and does not have a license to practise.

"What it means is that if you're an admitted lawyer but don't have a current practising certificate for 2014, you cannot practise law in this country. Now in the case of Mr Williams, it meets neither requirements," he said.

He says Mr Williams will be deported from the country and will leave on the next available flight.

Justice Cannings set up a human rights inquiry earlier this month to examine the conditions of asylum seekers at the Australian facility.

The PNG government put the inquiry on hold on March 21 after it obtained a stay order from the supreme court.

Justice Cannings responded by initiating a new inquiry.

The PNG government is seeking to appeal against Justice Cannings's refusal to disqualify himself from the inquiry over allegations of bias.

On Wednesday, PNG's public solicitor Frazer Pitpit sought an adjournment when the matter returned to court because he did not have a practising certificate.

Justice Cannings has held a week of hearings and also allowed a handful of journalists to join him on his second visit to the detention centre, which is normally barred to media.

One of the more confronting images witnessed by media was a plaque on one of the fences requesting that all security guards carry a Hoffman knife.

Members of the media were told that the knives were used to cut down people who tried to hang themselves.