It could be bad news for Aucklanders wanting to leave alert level four.
Three people who visited Middlemore hospital have now tested positive for Covid-19.
There are also 36 cases with no links to the current outbreak.
Auckland University Covid Modeller Shaun Hendy says Auckland could be locked down for awhile.
He says the restrictions could last a further 10-14 days.
He also says there could be another cluster out there.