A 24-year-old Australian man, sentenced to 20 years in jail for murder in Bulgaria, has been "buoyed" by two police witnesses supporting his version of events.

Jock Palfreeman says he feels buoyed by the latest development as both police officers support his story that he was acting in self-defence when he pulled out a knife and fatally stabbed the victim, ABC News reported.

The Australian was convicted of murder over the 2007 death of Andrei Monov, 21, during a street fight in the Bulgarian capital, Sofia.

Witnesses are being cross examined against their original statements which they contradicted during the trial.

A policeman and a policewoman told the court on Thursday that, on reflection, they stood by their original statements that Palfreeman had gone to the aid of a Roma gypsy who was being beaten by a group of 12 Bulgarian men.

Jock Palfreeman, 23, has been kept behind bars in a Bulgarian jail after being charged with murder after an alleged street brawl in the capital Sofia at the end of 2007.

According to Bulgarian prosecutors, who asked for life imprisonment for the defendant, Palfreeman was not provoked and did not act in self-defense, as he has claimed.

Palfreeman was also found guilty of attempted murder over the alleged stabbing of a 19-year-old man during the fight.

The Sydneysider has repeatedly denied both charges, saying he was trying to defend himself from being attacked by a group of men.

According to Jock's family, friends and supporters his verdict is a "hideous perversion of justice".

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