The anti-secrecy group's chief has been based at the Ecuador embassy in central London since 2012 after he lost appeals against sexual assault charges in Sweden.
The request for diplomatic status was made on behalf of the 46-year-old campaigner by the Ecuadorean government, which has reportedly issued a passport to the Australian national after he had sought political asylum from the South American country five and a half years ago.
"Ecuador knows that the way to resolve this issue is for Julian Assange to leave the embassy to face justice," the spokesperson added.
According to media reports from Ecuador earlier this week, Assange has been registered to the province of Pichincha, which covers the capital Quito.
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The public database of the country's internal revenue service indicates that the travel document was delivered to Assange on December 21, indicating that the country is preparing for the campaigners exit from his London hideout.
While the grant of a passport has not been officially confirmed, it is seen as part of a process to get Assange out of the UK by giving him a role at the embassy that confers diplomatic immunity.
The rape allegation against the computer programmer had followed a Wikileaks conference in Stockholm in 2010.
Assange has always denied the sexual assault allegations against him, claiming the sex was consensual and that the case was politically motivated to get him extradited to the US over massive Wikileaks dumps of secret US military reports that year.
Assange also fears he will be extradited to the US if he leaves the building over a sealed indictment ordering his arrest.
A United Nations panel had concluded in 2016 that Assange was under arbitrary detention. But the British government has maintained he must face justice in UK courts over his breach of bail conditions.
WikiLeaks is an international non-profit journalistic organisation that publishes secret information, news leaks and classified media from anonymous sources.