There have been two new cases of Covid-19 reported in New Zealand today, including a health worker who works at the Jet Park quarantine facility in Auckland.

There was no media conference held today.

In a statement, the Health Ministry said one of the two new cases was a returnee to New Zealand in managed isolation and the second was the health worker.

The Ministry said five household contacts of the health worker are in isolation at their home and are being tested today.

"This case is still being investigated to determine if the infection came from the community or from within the quarantine facility, though at this stage no obvious links to other cases in the community have been established."

The returnee in managed isolation arrived from South Africa on September 8 and remains in quarantine in Canterbury.

There were two new cases reported yesterday and one new case on Friday. All three were associated with the Mt Roskill Evangelical Fellowship bereavement events group.

Today's numbers come on the eve of the latest government announcement on the country's alert levels.

Earlier this month, Prime Minister Jacinda Ardern extended the current alert levels in New Zealand, and said Cabinet will review the situation again on September 14.

If a change to alert levels is made tomorrow, it will take effect from 11.59pm on Wednesday September 16, says Ardern.

The Auckland region is currently at alert level 2.5, which is due to expire this week. At present Aucklanders can travel outside the region, though social gatherings are limited to no more than ten people, with 50 allowed for authorised funerals and tangihanga. The rest of the country is at level 2.

If you have symptoms of the coronavirus, call the NZ Covid-19 Healthline on 0800 358 5453 (+64 9 358 5453 for international SIMs) or call your GP - don't show up at a medical centre.