Speaking at a parliamentary inquiry into Victoria's Games bid on Monday, Department of Premier and Cabinet secretary Jeremi Moule said he first flagged cost blowouts with then-premier Daniel Andrews on June 13.
"All options were on the table", including considerably reshaping the Games or cancelling them altogether, Mr Moule said.
"It was the advice of my department, provided by me personally to the premier, that gave the government cause to reconsider the delivery of the Games and in fact, whether to have them at all," Mr Moule told the inquiry on Monday.
He then booked flights to London, aware that whatever decision was made he would need to make a considerable announcement to the Commonwealth Games Federation - which he felt needed to be delivered in person.
He left Melbourne on July 15 and was notified of the decision to cancel the Games on July 18.Earlier the inquiry heard now-Premier Jacinta Allan was told the Games would cost almost $2 billion more than first thought months before cancelling the event.
Department of Jobs, Skills, Industry and Regions secretary Tim Ada said Ms Allan, who was then head of the event's delivery, was warned in early March.
The department's updated budget estimate of $4.5 billion was knocked back in April as it was told to explore cutting costs while still meeting the government's regional hosting commitments, Mr Ada told the inquiry.
It was announced in April 2022 that multiple regional centres would host the Games, with a cost of $2.6 billion confirmed in the state budget the following month.
Top Victorian public servant Tim Ada says the government was warned about the cost blowout.
But the Games were canned on July 18, with Mr Andrews citing an up to $7 billion cost.
Mr Ada said his department provided another submission to Ms Allan in June seeking $4.2 billion but it was not formally considered and rejected on July 14.
The Victorian government first sought legal advice on withdrawing from the Games on June 14, the day before Ms Allan told a budget estimates hearing Victoria had made "tremendous progress" on the event.
Mr Ada found out about the legal advice being sought about June 19.
In his evidence, former chief executive officer of the now-defunct Office of the Commonwealth Games Allen Garner said he was kept in the dark about the hiring of lawyers.
Mr Garner had no knowledge of how the updated costing figure of $6.865 billion came to be.
"Well, it looks like it is made up ... because no one can tell me how we got there," inquiry deputy chair and Liberal MP Joe McCracken fired back.
Ms Allan has repeatedly said the revised cost estimate of between $6 billion and $7 billion materialised in the weeks leading up to the cancellation.
She confirmed last week she received a letter from organising committee chair Peggy O'Neal after asking for a $722 million boost to its $1 billion budget on February 22.
Ex-Office of the Commonwealth Games boss Allen Garner says he wasn't told about lawyers being hired.
The inquiry will request Ms Allan give evidence but she has ruled out appearing.
The Victorian government agreed to pay $380 million in compensation to organisers as part of a settlement.
Departmental documents show additional costs of more than $150 million, taking the total beyond $500 million.
Mr Ada told the inquiry his department's full Games cost would be about $200 million, including spending on regional housing commitments which the government will fulfil.
The inquiry will deliver an interim report by the end of April and a final report 12 months later.
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