FORMER Australian Workers Union official Ralph Blewitt has been granted another adjournment in a Perth court over the alleged embezzlement of more than $400,000.

The 71-year-old has been charged with 31 counts of fraud dating back to the early 1990s over a union slush fund set up by then-union boss Bruce Wilson when he was in a relationship with former prime minister Julia Gillard.

The alleged fraud involved siphoning union funds extorted from major construction companies for personal benefit, including the purchase of a house in Melbourne in 1992.

Mr Blewitt is yet to enter a plea but claims he never benefited and did nothing wrong intentionally.

He appeared in Perth Magistrates Court on Friday where the matter was adjourned to December 20 and he had his bail renewed so he could return to Malaysia.

The royal commissioner into union corruption Dyson Heydon cleared Ms Gillard of criminality in 2014 but recommended charges be considered against Mr Blewitt and Mr Wilson although the latter, who denies any wrongdoing, has not been charged.

Ms Gillard attacked Mr Blewitt's credibility in 2012 when he said she had questions to answer about the slush fund, which was called the AWU's Workplace Reform Association.