Victoria's ombudsman is under pressure to release a potentially explosive report into former deputy police commissioner Sir Ken Jones.
The state's police watchdog, the Office of Police Integrity (OPI), has forwarded its final report into allegations that Sir Ken leaked sensitive and damaging details of police matters to undermine then police chief Simon Overland.
Previous watchdog reports have found no evidence that Sir Ken was actually leaking information and found that Mr Overland had damaged Sir Ken's reputation, though Mr Overland was cleared of detrimental conduct.
Separate investigations continued despite their departures with links to a state government minister's office, senior police command and both corruption agencies.
The details of this most recent investigation - the last by the OPI before it closes its doors on Friday - will remain classified unless the ombudsman decides to make it public.
OPI acting director Ron Bonighton said he had to forward the report to the ombudsman because it was the only agency tasked with covering whistleblower complaints.
"I am unable to comment on the outcome of the investigation, save to say, there were a number of difficulties encountered in the course of the investigation which are outlined in the report," Mr Bonighton said in a statement.
"It is now up to the ombudsman to decide what further action, if any, is appropriate."
The ombudsman's office has been contacted for comment.
Opposition Leader Daniel Andrews wants the report to be made public.
"There's absolutely no doubt it's in the public interest for every Victorian to see and therefore understand exactly what went on," he told reporters on Thursday.
"That's exactly what should occur."
But Premier Ted Baillieu said he wouldn't step in to make it happen.
"We're certainly not going to interfere with those integrity bodies," he said.