Up to 1000 police ready to meet protesters

Up to a thousand police officers will be on duty to meet anyone considering attending an anti-lockdown protest in Sydney this weekend, NSW Police Commissioner Mick Fuller has warned.

Mr Fuller told a press conference on Friday that police had already detained 60 people from last week's protests and issued more than 200 infringement notices.

The commissioner said after monitoring online activity, police had to "expect there's going to be a protest".

"It appears it will not be in the same numbers. But ...(it) can still be violent," the commissioner said.

"Please don't come into Sydney tomorrow to protest. If you do, you will be met by up to 1000 police who will be ready to deal with you, whether that be via the health orders or other laws," Mr Fuller warned.

NSW Chief Medical Officer Kerry Chant said authorities were still investigating whether a COVID-positive person had attended last Saturday's protest, which saw thousands march through Sydney's CBD demonstrating against the state's lockdown laws.

NSW Police have confirmed a 35-year-old man from Granville, in Sydney's west, was caught more than 20km away at the city's central station by police targeting protesters, despite being subject to stay-at-home orders.

The man, who was fined $1000 dollars, was directed home and tested positive to COVID the next day.

"We're just working with police to ascertain whether that person did attend. The police did indicate they had turned the person around and they had given an infringement notice," Dr Chant told reporters.

"If that person would have attended the protest, they would have been infectious."

NSW Health Minister Brad Hazzard said if the COVID-positive man had attended the rally, "he was effectively carrying a deadly weapon, he was carrying the virus".

Dr Chant said investigations were still underway to work out whether any of the new NSW cases could be linked to the protest.

"People may not be open that they attended the protest. I am not aware of any cases that have arisen from the protest but many people may choose not to disclose that," Dr Chant said.

"I am totally committed to the fact that we need to have low tolerance for where people are flagrantly breaking the rule - this is too much of a severe disease, too serious a situation to be in, to have people knowingly going out when they are positive," she told reporters.

A NSW Police strike force was set up following last week's protests with up to 20,000 tip-offs to Crime Stoppers about attendees, with photos and names sent to police.

On Friday Mr Fuller said police will be waiting for anyone planning to protest this weekend, and they had been given plenty of warnings.

Mr Hazzard had his own warning.

"You have to be crackers to go to that demonstration tomorrow because there will be a lot of people potentially with a deadly weapon, Delta virus," Mr Hazzard said.

NSW Premier Gladys Berejiklian told would-be protesters, "your actions will hurt".

"Do not give those you love the most a death sentence," she said.