These four cases are household contacts of the fifth case confirmed on Tuesday morning in the Whittlesea cluster.

The Department of Health confirmed the four positive test results.

Earlier: Victoria's active cases rise to 13, Melbourne restrictions return

"This afternoon, the department has been notified of four new cases," a spokesperson said.

"They are all family contacts of the fifth case announced this morning, bringing the total of cases in this outbreak to nine."

The greater Melbourne region will enter the following restrictions from 6pm on Tuesday:

The restrictions will be in place until at least June 4.

The latest cases bring the state's total to 17 active cases of coronavirus, with nine cases in the cluster.

The coronavirus cases in the northern Melbourne cluster are linked to a man who acquired the virus while in hotel quarantine in Adelaide earlier this month.

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Chief heath officer Brett Sutton confirmed the coronavirus strain in the Whittlesea cluster was "the so-called Indian variance".

The total number of confirmed cases, including the four unconfirmed cases, in Victoria since the start of the pandemic is 20,547.

The New Zealand government placed a 72 hour pause on flights from Victorian throughout the Trans-Tasman bubble following the confirmation of five new coronavirus cases in the state in past 24 hours.

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