Cambodia says it will send a team to a detention centre on Nauru next month to interview two refugees, reviving the resettlement agreement with Australia that seemed on the verge of collapse.

Cambodia agreed with Australia in 2014 to take in refugees from Nauru in exchange for $40 million in aid, but it later threatened to withdraw from the agreement.

The Government also offered to pay $15.5 million to the International Organisation for Migration (IOM) to support the refugees who moved there.

Only five people have gone to Cambodia under the pact and three of them later chose to go back home, but now two more might be on their way.

"Our team is ready to go and interview two more refugees who volunteered to be resettled," said Tan Sovichea, the head of the Cambodian Interior Ministry's refugee unit.

He said his three-person team would fly to Nauru in the first week of June to vet the refugees, who are an Iranian man and woman.

Rights groups have condemned Australia for trying to resettle refugees in poorer countries such as Cambodia, which is frequently accused of human rights abuses and has an economy less than one percent the size of Australia's.

Cambodians critical of the deal protested outside the Australian embassy in Phnom Penh when the agreement was signed almost two years ago, saying the country was unable to look after its own people and should not take the refugees.

Mr Sovichea said Australia had originally delayed the trip which was supposed to be on May 2, and Australian officials had not yet set an exact date for the trip in June.

The ABC has approached the Federal Government for comment.

Reuters