A Melbourne nurse allegedly undertook "guard duty and reconnaissance" in Syria to help the Islamic State, court documents state, before he turned himself in to authorities.
Adam Brookman will be extradited to Victoria to face court after being arrested at Sydney International Airport on Friday night.
The father-of-five's travel home from the Middle East was facilitated by Australian agencies after he turned himself in to Turkish authorities this week.
The 39-year-old appeared via video link in Parramatta Bail Court on Saturday, where a magistrate granted his extradition south.
Brookman, who was sporting a hoodie as he was held in custody at the Surry Hills Police Centre, did not speak during the brief appearance.
A warrant for Brookman's arrest on two terrorism-related charges was issued on Friday.
Court documents outline one charge relates to Brookman knowingly providing support to IS by undertaking guard duty and reconnaissance between April 2010 and August 2014.
It is alleged that support would help the group "prepare or foster" a terrorist act.
The second charge relates to undertaking the guard duty and reconnaissance with the intention of supporting IS.
Brookman will be escorted by AFP officers to Victoria, where he is expected to be charged.
He is due to face Melbourne Magistrates Court on Monday.
The AFP are remaining tight-lipped on when Brookman will be taken to Victoria, where he has listed his address as in Coolaroo, in Melbourne's north.
Brookman has claimed to Fairfax Media he was in Syria for humanitarian work, but was forced to join the terrorist group after being injured and sent to IS-controlled territory.
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