Victorian Premier Daniel Andrews has moved to quash "shameful rumours" four years after a car, driven by his wife, hit and seriously injured a teenage boy on the Mornington Peninsula four years ago.

Key points: Catherine Andrews had not been drinking on family beach holiday, Premier says

Catherine Andrews had not been drinking on family beach holiday, Premier says Investigation only looking into police conduct, IBAC says

Investigation only looking into police conduct, IBAC says Crash was 'sickening, awful' and boy 't-boned' the car, Andrews says

On Wednesday Victoria's anti-corruption watchdog said it would review how police at the scene handled the incident at Blairgowrie, in January 2013.

Today, the Independent Broad-based Anti-corruption Commission (IBAC) said it was investigating the conduct of the officers at the scene, and not Mr Andrews or his wife.

Catherine Andrews was driving when the teenage cyclist collided with the car. Mr Andrews, who was the opposition leader at the time, and their three young children, aged 11, nine and six, were also in the vehicle.

The boy sustained upper body injuries and was flown to the Royal Children's Hospital in Melbourne.

The two officers who were called to the crash failed to conduct a breath test on Ms Andrews, which is standard protocol.

Police Commissioner Graham Ashton said the pair had simply "mucked up" at the busy scene, and one thought the other had done the test.

They were reminded of their obligations and no further action was taken against them.

'He absolutely T-boned the car'

Today Mr Andrews called a media conference to address the issue, which was raised again after a Freedom of Information (FOI) request was made by media and rejected.

Another request has been made by the Victorian Opposition.

"There are a lot of rumours flying around, there's a lot of pretty awful stuff being peddled around the place, and I want to answer it once and for all," he said.

Mr Andrews said the family was returning to the place they had rented in the popular holiday town, after a morning at the beach, when his wife made a right turn.

He said there was a bike path running along the side of the road, which was well hidden by tea trees.

Mr Andrews said the boy suddenly hit their car in what was "probably one of the most sickening, awful things I have ever experienced".

"He was moving at speed, he absolutely T-boned the car, hit it at such force he was literally inside the car. That's how much the windscreen was depressed, he flew up over the car and hit the road," he said.

Mr Andrews said the windscreen shattered all over their children, who were screaming.

Ms Andrews helped the boy, who asked her to call his sister, while Mr Andrews called triple-0.

Mr Andrews said neither of them had been drinking and one of the police officers later apologised to Ms Andrews for not breath-testing her after the crash.

'I wish I was the one driving'

The Premier said he and his wife were completely comfortable with any documents being released under the FOI requests, but that was a decision for police.

"I want to make it abundantly clear I have no objection, I have no problem, no concern, with documents being released but that is not a decision that I make," he said.

Commissioner Ashton told 3AW this morning the requests were rejected for privacy reasons.

Daniel Andrews said his wife Catherine was calm throughout the entire incident. ( AAP: Joe Castro )

"There was a decision taken that the people who requested it, the media outlet, weren't the people involved, and it would have been releasing that private information to them," he said.

Last week, Opposition MP Christine Fyffe used parliamentary privilege to question whether there was a "deliberate concealing of facts" about the incident.

Mr Andrews denied speculation he was the one behind the wheel, and not his wife.

"She was driving, but I wish I had been driving because then maybe she'd be spared some of the quite shameful stuff that's been put around, and maybe things would be different," he said.

There had also been questions raised about why Mr Andrews or his wife had not contacted the boy's family in the aftermath of the incident.

He said he was advised by police at the time not to contact them.

"I didn't ask why, it's not my business, but the last thing I was going to do as a public official was defy Victoria Police, and then perhaps I'd be here answering your questions about why I had done that," he said.