"I don't know what the future brings, the crystal ball hasn't fired up lately," he told reporters on Tuesday.
"As soon as that decision is made we will be sharing it with all Victorians."
Victoria records 20 local COVID-19 cases
There are more than 12,000 close contacts of infected cases self-isolating and almost 250 exposure sites across Melbourne.
Of greatest concern to authorities is Caroline Springs Square Shopping Centre, where half of Tuesday's new cases contracted the virus.
COVID-19 Commander Jeroen Weimar said a total of 25 cases are linked to the shopping centre and he urged anyone who had attended between 27 July and 5 August to get tested.
He said 400 tests were done at a pop-up site near the centre on Monday, but that number needed to be much higher.
Two of the cases linked to the shopping centre were not close contacts of previously infected people and authorities are working to track down how they caught the virus.
Three new cases live in Flemington's public housing towers but they have been transferred to hotel quarantine along with their household contacts.
Mr Foley said younger Victorians flooded state vaccination hubs on Monday, the first day AstraZeneca was available to those aged under 40.
There were 2,366 first doses of the vaccine administered, a three-fold increase on the previous week.
"Young people are coming forward to get vaccinated, they're doing it for their local community, sporting clubs, their cultural organisations, they're doing it for their workplaces and they're doing it because they want to get to a COVID normal world as rapidly as we possibly can," he said.
The health minister also congratulated the Al-Taqwa College school community, after 1252 people got vaccinated at the school's pop-up site.
There are now 76 cases connected to the latest outbreak and 111 active infections in the state in total.
Two people are in hospital, but for the first time in weeks, there are no cases in intensive care.
It comes as regional Victoria came out of lockdown at midnight, though a number of restrictions remain in place, including a ban on home visits and compulsory mask-wearing.
City dwellers trying to flee Melbourne into regional areas will face fines upwards of $5,000, as about 200 police patrol main and back roads across the state.
Regional Victoria businesses, such as restaurants and beauty salons, must check the IDs of customers.