Councillors from the City of Casey face a public grilling about alleged business dealings with, and undeclared political donations from, John Woodman, the developer at the centre of the Victorian anti-corruption commission’s investigation into land deals in Melbourne’s south-east.

An expected three weeks of public hearings start on Monday as part of the Independent Broad-based Anti-corruption Commission's Operation Sandon, the most significant probe of property and planning-related corruption in Victoria for decades.

Operation Sandon is looking at issues including those raised in stories in The Sunday Age in October and November last year.

One councillor unlikely to appear at the hearings is former mayor, councillor and Liberal activist Sam Aziz, who left the country on extended leave weeks ago as Operation Sandon stepped up and homes and offices were raided.

The Age understands IBAC has already privately questioned Cr Aziz.