The Murrumbidgee Health District's message comes as the city readies for a massive weekend with Gold Cup and the NRL game this weekend and after the state recorded a mystery case yesterday in Sydney's eastern suburbs.

Tony Burns, senior environmental health officer, said anyone visiting Wagga this weekend from Sydney needed to regularly check the NSW Health website or Facebook page for a list of venues where they may have been exposed.

He added that residents and visitors should carry hand sanitiser, maintain social distancing as much as possible, and those with the slightest symptoms should stay home get tested.

"With the case of COVID in Sydney, we are just trying to ensure that people in Wagga and businesses are aware that COVID requirements still need to maintained," Mr Burns said.

"We know that many people are going to be visiting Wagga for the Gold Cup and the NRL match that is here over the weekend.

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"People from Sydney are allowed to travel. There is no doubt about that. But anyone that has been to venues that are on the NSW Health website, they're the ones who are not allowed to travel."

Mr Burns said the MLHD Public Health team is out and about, supporting local venues to ensure their COVID safety plans are in place.

He added the onus is on them to make sure that anyone who enters their business has checked in.

"Make sure you see that green tick," Mr Burns said.

During her 11am press conference, NSW Premier Gladys Berijiklian said the wife of the Sydney man who tested positive yesterday has also been diagnosed with COVID-19.

As a precaution, Greater Sydney will face new restrictions from 5pm today until 12.01am on Monday.

"We ask that nobody welcome more than 20 people into your home," she said.

"There will be no singing or dancing in indoor venues, including places of worship and entertainment venues. The exception is weddings. We recommend that only 20 people at a time be on the dance floor.

"In relation to mask-wearing, mask-wearing at indoor places will be compulsory for the next three days. Public transport, if you go to the supermarket, any indoor event, will require compulsory mask-wearing in addition to hospitality workers and people serving you."

Ms Berijiklian said the government believed it was a "proportionate response" to the risk.

Chief health officer Kerry Chant said through genomic sequencing, NSW Health has been able to identify the original overseas traveller who brought the virus into the country. However, they still do not know how this person spread it to the 50-year-old man who was diagnosed on Wednesday.

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