The Australian Greens party is calling on people to join an organisation which is offering to hide asylum seekers from East Timor if the Federal Government tries to deport them.

The Greens say the Government will send thousands of asylum seekers back if it wins a case currently before the Federal Court.

Daniel Cass, representing Greens Victoria says the Sanctuary Movement is the only hope for the East Timorese.

"The Sanctuary Movement is an Australia-wide network of people who are offering their homes, and where possible their work places as safe houses for Timorese political refugees who the Government is quite alarmingly attempting to deport by claiming they are actually Portuguese citizens."