Victoria's "circuit breaker" lockdown extension has been confirmed, after days of the state recording a rise in Covid-19 infections.

The lockdown was originally set to end at 11.59pm on June 3, but now the tough restrictions will be extended for at least seven days, according to the Herald Sun.

Six new locally acquired Covid-19 cases were confirmed overnight, bringing the state's cluster to 60.

More than 51,000 test results were received in 24 hours and more than 20,500 vaccine doses were administered.

It comes after senior government ministers met overnight to discuss the next step for the state. It is understood this included discussion around whether different restrictions will be introduced for regional Victoria.

The Herald Sun also revealed the Victorian government is expected to extend its $250 million businesses support package as a result of the longer lockdown.

A cabinet minister told The Age the highly transmissible nature of the B.1.617 strain seen in Victoria is one of the major reasons for considering a lockdown extension.

This strain was first detected in India and has since spread to more than 40 countries, with the World Health Organisation (WHO) identifying it as a "variant of concern" as it appears to be much more infectious than other strains.

Cabinet ministers were reportedly told the options for the length of the extension were between three and seven days, with a final call made on Wednesday morning.

WHO adviser and University of NSW Professor Mary-Louise McLaws said from an epidemiological perspective, Victoria's cluster was still growing, meaning a lockdown extension is necessary.