Lawyers for WikiLeaks editor-in-chief Julian Assange have filed an appeal against his extradition to Sweden to face questioning on sex charges, a member of his defense team said Thursday.

The appeal was submitted to London's High Court on Tuesday, but lawyers do not expect the case to be heard for another two or three months, said Jennifer Robinson, who is part of Assange's defense team.

A judge at Belmarsh Magistrates' Court ruled on February 24 that Assange should be extradited from the United Kingdom to Sweden to face allegations of sex crimes.

He says the charges are an attempt to smear him.

The case is not related to the work of Assange's website, which facilitates the publication of secret information. It made headlines last year for leaking documents and videos related to the wars in Iraq and Afghanistan, and thousands of U.S. diplomatic cables, CNN reported.