New South Wales reports eight new cases of COVID-19, new Christmas rules announced

New South Wales has recorded eight new cases of COVID-19.

Seven of the cases are linked to the Northern Beaches cluster and the eighth is a healthcare worker, thought to have contracted the virus from an international arrival.

It brings the NSW outbreak to 97 cases.

Premier Gladys Berejiklian told reporters on Wednesday the cases are the result of a massive testing spree on Monday.

"I want to thank the nearly 42,000 people that came forward yesterday to get tested," she said.

She went on to thank the efforts of NSW public health officials, saying they have done an "unbelievable" job. 

"We have seen in other jurisdictions where there were 30 cases or more, what the outcome was.

"To date, we have not seen that trend in New South Wales, we have actually seen the reversal, and our health team has been outstanding."

Berejiklian also announced a slight tweak to Sydney's COVID-19 restrictions over Christmas.

"For greater Sydney, there is one tweak - on the 24th, 25th and 26th you can have ten people in your home and children under 12."

This change allows young children to be additions to the ten person limit. But Berejiklian stressed the ten adult limit was strictly still in place.

"You cannot have different groups of ten people throughout the day - it is one group of ten."

Once Boxing Day has passed, the restrictions will revert back to ten person gatherings including children.