There is now a total of 15 cases of COVID-19 with the Omicron variant in New South Wales, health authorities have confirmed.
NSW Health said results on "further likely cases" are due later today.
The state recorded 286 new cases of COVID-19 and one additional death in the 24 hours to 8pm last night.
A man in his 60s from south-eastern Sydney died at St George Hospital.
He had received two doses of a COVID-19 vaccine and had underlying health conditions.
Yesterday there was a total of 13 cases of the Omicron variant in the state.
COVID-19 cases with the Omicron variant have recently been linked to Regents Park Christian School, Sydney Indoor Climbing Gym Villawood, and St Peter Chanel Catholic Primary School in Regents Park.
There have now been five cases confirmed as being the Omicron variant of concern linked to these venues, in addition to a confirmed case in the ACT who likely acquired their infection at the Sydney Indoor Climbing Gym Villawood.
Genome sequencing is currently underway on several other COVID-19 cases linked to these settings.
One of the confirmed Omicron cases is a student at St Peter Chanel Catholic Primary School in Regents Park who attended the Sydney Indoor Climbing Gym in Villawood on Saturday, November 27.
All year three and year four students and teachers at St Peter Chanel Catholic Primary School have been deemed close contacts and asked to self-isolate.
"Contact tracing and genome sequencing is underway on several cases of COVID-19 identified in the school community," NSW Health said.
Anyone who attended the Sydney Indoor Climbing Gym on Saturday, November 27 between 9am and 4.30pm is a close contact who must immediately get tested and isolate according to NSW Health guidelines.
Two Omicron cases were detected last week in returned travellers who are family members of a child who tested positive on Thursday.
The family arrived on flight QR908 from Doha to Sydney on November 23.
NSW Health said they are isolating in the Special Health Accommodation.
People should continue to monitor for symptoms and if any symptoms occur, get tested.
There have been no cases with the Omicron variant admitted to hospital in NSW for treatment of COVID-19.