We're wrapping our Need To Know blog for the day, but will be back Monday morning with all the latest on COVID-19 outbreaks in NSW and Victoria as Australia goes back to work for the new year.

Here's a quick recap of what happened on Sunday:

• Another leak in NSW's hotel quarantine program has sparked a new coronavirus cluster, with thousands who visited a bottle shop in Sydney's west over Christmas being asked to self-isolate as NSW reported eight new local transmissions of COVID-19.

• Sydneysiders are now required to wear masks, with police to start issuing fines for non-compliance from midnight on Monday.

• While Victoria recorded three new local transmissions, Deputy Chief Medical Officer Allen Cheng said the absence of mystery cases suggests the outbreak is under control.
• Amid reports the Indian cricket team do not want to play the fourth Test in Brisbane due to strict quarantine conditions there, Queensland Chief Health Officer Dr Jeannette Young said cricketers were subject to the same quarantine conditions as anyone else and that she was confident the state would host the match.
• The Morrison government announced $10.1 million in funding for six clinical trials to move coronavirus research out of the lab and into human testing.
• There are fears the rising number of COVID-19 cases and associated border closures and lockdowns could dent the local sharemarket's extraordinary rally to wrap up the 2020 trading year.