A pre-trial court hearing has been derailed by concerns about a far-right anti-Islam extremist's fitness to stand trial over allegations he planned to bomb left-wing groups in Melbourne.

Phillip Galea, 32, is charged with making preparations for terrorist attacks against properties occupied by Melbourne anarchist groups between November 2015 and August 2016.

Victorian Supreme Court justice Lex Lasry on Wednesday ordered a psychologist's report on Galea's fitness to be tried, before a committal hearing in the Melbourne Magistrates Court can proceed.

It's understood the report will take six weeks to complete.

The pre-trial hearing was originally set down for May, but was delayed until August after the defence asked for more time to go through the evidence.

In August Galea's two-day committal hearing was again delayed while Victoria Legal Aid secured legal counsel to act for him.

The 32-year-old is charged with collecting or making documents to prepare for terrorist acts between November 2015 and August 2016.

The anti-Islamist is also charged with acts in preparation for a terrorist act between September 2015 and August last year.

Police have accused Galea of preparing to target various locations inhabited by the Melbourne Anarchist Club and Melbourne Resistance Centre.

He allegedly ordered potassium nitrate for smoke bombs, aligned himself with right-wing and neo-Nazi groups, and researched how to make improvised explosive devices.

Arson and explosive experts raided Galea's home in November 2015 and seized five cattle prods and 362.1 grams of mercury.

Computer equipment was also seized, and it's alleged Galea researched homemade bombs, ballistic armour and guns.

The defence and prosecution will return to the Victorian Supreme Court on November 29 for a further directions hearing about Galea's fitness to be tried.

Galea will remain in custody.