There are now four licensed venues - and a growing number of shopping precincts - that are linked to the South Western Sydney COVID-19 cluster, which has grown to 34 cases.
In her morning media update, NSW Chief Health Officer Kerry Chant said there were 13 new cases of the virus overnight, 10 of which are linked to the Crossroads Hotel in Casula.
Six of the cases attended the pub, two were close contacts of those who attended and two acquired the infection at the Planet Fitness Gym.
Since 8pm, she said there had been one extra case detected bringing the linked cluster to a total of 34.
Also at the media briefing, NSW Health confirmed the outbreak had been linked to the Melbourne outbreak.
The department's "chief virus detective" Jennie Musto said health workers had found that a number of workers from a freight company - including one man who travelled from Melbourne on June 30 - attended a party at the Crossroads Hotel on July 3.
"So as far as we know, this outbreak is well known to us and we've identified all links, at this point in time, but we'll get new cases and we'll have to identify further links with them and for the contacts and get them all to go into isolation as well," she said.
With the outbreak growing daily, Dr Chant said NSW Health was putting together a full list of affected venues on a website, which will list dates and times where any positive cases attended.
New venues, identified since yesterday include the YMCA at Revesby, Western Sydney Leagues Club in Leumeah, Macarthur Tavern in Campbelltown and Woolworths Bowral.
Dr Chant also reminded the public that anyone who attended the Crossroads Hotel between July 3 -10 should self-isolate for 14 days and get tested for COVID-19.
Anyone attended Planet Fitness between July 4-10 are also considered to be close contacts, and should self isolate for 14 days and seek testing.
She also said it was important people in other areas of the state did not become complacent.
Read also: Mayor urges continued COVID-19 vigilance
"We've had a very strong focus on the Crossroads Hotel cluster, but it's very important we don't lose sight of the fact that COVID could have been introduced in other parts of Syndey," she said.
"This is a stealthy virus and we need to maintain vigilance in other parts of the state."
I want you to come forward, if you've got any COVID symptoms, come forward."
She said coastal suburbs and border communities needed to have high rates of testing as they could have had visitors from Victoria.
"In this period we need to be increasingly vigilant," she said, and said she hoped to break testing records to reach 23,000 swabs per day.
NSW Health Minister Brad Hazzard likened the growing outbreak of COVID-19 to a new front of a war.
"When the war time comes back to us it has a bit in last two days, our community steps up," he said, thanking the thousands of people in South Western Sydney who had come forward for testing in the last two days.
Meantime in Victoria, Premier Daniel Andrews announced there had been a further 238 cases detected overnight.