The father of the Australian national, accused of stabbing to death a 20-year-old in Bulgaria last week, has arrived in the country to visit his son, Australia's national news agency AAP reported.

Paul "Jock" Palfreeman, 21, is behind bars in a Bulgarian jail after being charged with murder after an alleged street brawl in the capital Sofia last Friday. Palfreeman also faces a charge of attempted murder over the alleged stabbing of a 19-year-old man during the fight.

The Sydneysider denies both charges and says he was trying to defend himself from being attacked by a group of men.

His father Simon Palfreeman, a pathologist, arrived in Sofia on Friday (AEDT) from Sydney, APP reported, pointing out that the arrival came shortly after the burial of the victim Andrey Monov.

On Monday, Sofia's City court rejected Palfreeman's bail plea, with the judge ruling the suspect is aggressive and could attempt to hide from court. He has until Thursday to appeal, in which case his case will be heard again on January 8.

Bulgarian court experts claim Palfreeman's defence, who says he was acting in self-defence, is not backed by any evidence, with no further details of the case revealed so far.

Palfreeman, who is a trainee soldier in the British army, wanted British defence officials present to ensure a fair and transparent hearing because of fears that police and witnesses are not being objective.

But British army officials rejected the request, saying that because the man was not in Bulgaria for official defence purposes the matter was being treated as a consulate matter.

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