On Tuesday, Victorian premier Daniel Andrews announced that 10 Melbourne postcodes will go back into lockdown after a recent spike in coronavirus cases.

Now, the NSW government has revealed it will fine Victorians from affected hotspot suburbs up to $11,000 – and they could face up to six months in jail – if they enter the state.

The penalties were shared by NSW health minister Brad Hazzard on Wednesday, and also apply to NSW locals entering Victoria's hotspots.

“The message to NSW residents is: don't go to Victorian hotspots," Hazzard said. "Just don't go.

"Victorians living in virus hotspots have to take the Victorian and NSW health orders seriously. And should be very aware that NSW will impose additional penalties if they seek to leave their suburbs to enter NSW."

Stage three restrictions will be reimposed on the affected Melbourne suburbs from 11.59pm on Wednesday evening, and will be in place until at least July 29.

Residents will only be allowed to leave their homes to shop for food and other supplies, to exercise, to study or work (for those who cannot do so from home), and for compassionate reasons.

“Regular police patrols, both in these zones and outside them, will make sure people are abiding by the restrictions,” Andrews said.