The Australian Government is preparing to counter any damaging fallout from the imminent release of more classified documents by the whistleblower website Wikileaks.

The Obama administration is warning foreign governments that the WikiLeaks site is about to release sensitive US diplomatic cables.

It is understood Foreign Minister Kevin Rudd discussed possible implications with US secretary of state Hillary Clinton in a phone call yesterday.

There are concerns the material could include sensitive information about Australia's involvement in issues such as the conflicts in Iraq and Afghanistan.

Department officials are preparing to assess the significance of the leaks for Australian security interests.

The US State Department is already calling the release damaging, saying it could create tensions with other governments and jeopardise lives.

The documents are expected to be released within days.