The New South Wales government has extended the Greater Sydney Covid-19 restrictions it put in place last week because it has yet to identify the missing link between a quarantine case and the small Covid outbreak in Sydney's eastern suburbs.

The extension will last until 12.01 am on Monday May 17 rather than midnight tonight (Sunday May 9) despite there being no reported community transmissions and zero cases in the 24 hours to 8pm Saturday.

All of the restrictions from last week will apply aside from one change, which will allow customers to shop without masks. Retail staff will need to continue to need to wear masks, and people will also have to wear masks on public transport and in public indoor venues, including aged-care facilities.

Other restrictions include households limited to 20 visitors, including children. Visitors to aged-care facilities are still limited to two people per day.

Patrons will not be able to stand up drink and dance at pubs and bars, with an exception for weddings. Singing by audiences at indoor shows or at church is also not allowed.

The restrictions will be lifted at 12.01am on Monday May 17. Here's a list of where you can buy masks.