The Corruption and Crime Commission has finally admitted it had been investigating the sacking of former City of Perth chief executive Gary Stevenson.

WAtoday exclusively revealed on Tuesday the CCC was probing the dismissal of Mr Stevenson, after Lord Mayor Lisa Scaffidi and her eight councillors went behind closed doors in January to dump him.

Yet when WAtoday grilled the CCC last week about whether there were any investigations into Mr Stevenson, it said it "doesn't confirm or deny whether anyone or anything is being investigated". However, it was revealed on Wednesday an investigation may have already wrapped up by then.

"The inquiries included a number of private examinations which were concluded last week," the CCC said in a statement on Wednesday.

The CCC said it decided to comment about the "outcome of this preliminary investigation as a matter of fairness to all concerned in view of speculation in a recently published article."

The CCC said it uncovered no evidence of misconduct with Mr Stevenson's sacking.

"The former CEO left the position in January 2016 and, due to concerns about the circumstances of his departure, the commission conducted a preliminary investigation," the statement said.

Mr Stevenson's sacking came after he ordered an internal review last year to identify if there were any cases of undeclared travel by councillors for the past four years.

In October, the CCC found Ms Scaffidi failed in her duties by not disclosing gifts and contributions to travel in her annual return.

But in January, the lord mayor said Mr Stevenson's sacking had nothing to do with his calling an internal probe into councillors' travel.

"It is what it is and you can add it up and cut it up and slice it and splice it however you wish to, but today has been by mutual consent," Ms Scaffidi said.

"The issues of the last 12 months are still to be sorted out from my perspective and personally it's been a very interesting time...  a learning curve for me in terms of many of the governance issues for me."

Ms Scaffidi has been further under the pump since the Department of Local Government released a report in May which found she failed on dozens of occasions between 2008 and 2015 to disclose gifts and contributions in annual returns.

Following the report, Perth deputy mayor James Limnios broke ranks and called for Ms Scaffidi's head, saying her position had become untenable.

Despite the Labor opposition also calling on her to resign, the lord mayor refused to budge.

And Local Government Minister Tony Simpson said he had no plans to sack the council after a shambolic meeting in May.

The meeting descended into chaos with councillors firing insults and verbal salvos across the chamber after Cr Janet Davidson's shock vote of no confidence motion against Mr Limnios.

"I get the feeling they are acting like children around the dining room table and need a bit of clip behind the ear hole and how about we act like adults ... we are elected by the City of Perth ratepayers to do a job and we really need to look at that job and make sure we are providing good governance to the City of Perth," Mr Simpson said at the time.