An Australian citizen is alleged to have acted as a middleman to help send Australians through Turkey to fight in Syria, the ABC has learned.

Court documents allege an Australian named Mohammed Ali Baryalei worked in Turkey in conjunction with Sydney man Hamdi Al Qudsi to send Australian fighters into Syria.

Al Qudsi has been charged with sending six young Australians to fight in Syria, including two who were killed in rebel infighting last week.

Baryalei has not been charged and is thought to still be in Turkey.

The passage of Australians through Turkey to Syria raises some troubling questions, because getting involved in the war there is a crime.

According to the prosecution's claims in the Statement of Facts given to the Bankstown court hearing the Al Qudsi case, he sent the men to join an Al Qaeda-linked group.

The ABC can reveal that the Statement of Facts alleges that Al Qudsi was able to give the recruits advice about accommodation, currencies and security half a world away.

The document alleges Baryalei was Al Qudsi's middleman on the Turkey-Syria border.

It is alleged Baryalei took off on a flight from Australia to Tokyo on the April 10 last year.

Just two months later, according to the statement of facts, Australian police intercepted a chilling phone call.

It indicated that Baryalei had been to a battle where people had been killed and injured.

Australian Caner Temel was reportedly killed while fighting for a jihadist group in Syria ( ABC News )

While these are serious allegations, Baryalei has not been charged and they have not been tested in court.

But the claims raise even deeper concerns about the link between Australians and jihadists in Syria.

Earlier this week a member of the Islamic State of Iraq and the Levant (ISIS) group told the ABC that Sydney man Caner Temel, 22, had been shot in the head during a battle between his ISIS unit and less extreme rebels.

Temel was one of the men Al Qudsi is accused of having sent to Syria.

His death came days after the killing of Sydney man Yusuf Ali and his young wife near Aleppo. Ali was another of the men alleged to have been sent to Syria by Al Qudsi.