Westpac has confirmed that a staff member at its head office has tested positive for Covid-19, and employees are being asked to monitor their health.

The bank spokesman said the non-customer facing employee contracted it from a close contact.

"As soon as they became aware a member of their household had contact with a Covid-19 case, the employee self-isolated. The self-isolation started last Friday evening and official advice is that the staff member would not have become infectious until Tuesday of this week."

However, the spokesman said that as a precaution, the bank was deep cleaning the workspace and floor where the staff member worked.

He said other standard Covid-19 procedures, including asking the employee's colleagues to monitor their health, had been instituted.

"We're in frequent contact with this employee and are offering full support," the spokesman added.

Nine new cases - eight in managed isolation and one household contact of one of the marine employee cluster cases - were reported in New Zealand today, director general of health Dr Ashley Bloomfield said.

The Ministry of Health has been approached for clarification if the Westpac case is among those reported today.

There are 1923 confirmed cases now and a total of 66 active cases.

The one new community case is a close household contact of one of the cases from the marine employee cluster.

There are a total of 66 active cases.

New Zealand's labs completed 6053 tests yesterday.