“Please, we want to discourage people,” she told reporters today.
“We know this is not the easiest message to give to those retailers but we want to discourage people go to the CBD tomorrow.
“If you’re going shopping in the CBD, make sure you wear a mask.”
Ms Berejiklian stressed that it only took one confirmed COVID-19 case for the virus to spread elsewhere.
NSW Chief Medical Officer Dr Kerry Chant said two are household contacts of a previous mystery case on the Northern Beaches, and one is a person who works in the region.
Dr Cant also raised concerns about “potential spread through the Sydney’s CBD” following emerging cases outside of the Northern Beaches.
She highlighted a number of inner-city venues which are linked to potential community transmission.
More than 69,800 people across NSW took a COVID test, beating the 60,184 tests that were reported yesterday.