Victoria has confirmed seven new locally acquired Covid-19 cases.

Authorities confirmed the seven cases were linked to a returned family and a crew of removalists, who both came into the state from New South Wales while unknowingly infectious.

Four of the new cases live on the third floor of the Ariele Apartments in the inner-west Melbourne suburb of Maribyrnong.

The complex was put into lockdown on Monday, with authorities revealing the infected removal crew spent up to five hours moving furniture into the building and shared lifts with residents.

The removalists also visited sites in Ballan and Broadmeadows before driving to South Australia and then returning to NSW, where they tested positive to Covid-19.

Another of the new cases is a man in his 60s who visited the MCG on July 10 between 4pm and 8pm.

It was revealed on Tuesday that 300 primary close contacts had been identified in Victoria and linked to the NSW travellers. They were ordered into isolation for 14 days.

Earlier today, Victoria posted one new locally acquired Covid-19 case. The new infection was a known primary close contact in isolation during their infectious period.

Victoria now has 19 active coronavirus cases.

97 new cases in NSW, lockdown extended

NSW recorded 97 new community Covid-19 cases today and extended the Greater Sydney lockdown for at least two weeks.

Premier Gladys Berejiklian had foreshadowed the extension was coming, saying this week it would be virtually "impossible" for the stay-at-home orders to be lifted at midnight this Friday as planned.

Today's new cases bring the total number of infections in the Sydney outbreak to 864.

Of the new cases, 60 were isolation throughout their infectious period, seven cases were in isolation for part of their infectious period and 24 were infectious in the community. The isolation status of six cases remains under investigation.