Victorian Premier Daniel Andrews has not yet announced a hard border closure with NSW but says it could come after a national meeting.
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The Australian Health Protection Principal Committee is meeting and Mr Andrews said that might determine a change in border zones.
"I'm not announcing any changes at all right now, I'm being clear with you, people are looking at this," he said.
"If you are there (in NSW), and you are coming home anytime soon, I'd come back today."
The impact on border communities if all of NSW is made a red zone - requiring a mandatory 14-day isolation period upon return - was raised with the Premier.
"Those border bubbles are unchanged," he said.
"The message I would send, having grown up not far from that border myself ... we understand that any changes to that bubble is very challenging (and) we will do everything we can to minimise that.
"But safety has to come first.
"It's not like if you live on the Murray, you can't get COVID ... so it's for your safety as well that we're doing everything we can to keep the virus out of the community."
Mr Andrews said if there is any change following a AHPPC meeting, Victoria would announce it.
"It will probably be 30 minutes or so, and then we will know, but I think that's something that AHPPC is certainly looking at, and it's something that our government has been looking at throughout the course of the last 24 hours; we reserve the right to make our own decisions in relation to both the Greater Sydney area and regional New South Wales.
"It looks like there may well be a consistent position out of AHPPC (on hotspots) and that's always better if we can all work together.
"I won't speak for AHPPC ... we've been giving some consideration all day, and most of yesterday to whether all of NSW goes red and I won't hesitate to do it."
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