If Covid-19 is detected in the community tomorrow, it won't necessarily prevent Auckland from moving out of level three.
Health boss Dr Ashley Bloomfield says it would depend on where those cases are from.
He says at the moment, all 15 community cases are within four families and contained.
Bloomfield says wide testing rates will make up an important part of his advice to Cabinet tomorrow as that will show whether the virus has spread outside Auckland.
He says the travel people could have done in and out of Auckland in the week Case M was in the community was the key reason for putting the rest of the country into level two.
Yesterday more than 14,500 tests were processed - almost 8,000 of them across Auckland.
A decision on alert levels is expected in the afternoon after a Cabinet meeting.
Meanwhile, Destiny Church's Brian Tamaki has been described by the Covid Response Minister as irresponsible.
The self declared apostle and his wife, Hannah, left Auckland on Saturday night before Alert Level Three kicked in on Sunday morning and conducted a church service in Rotorua.
They're now touring the country, and Chris Hipkins says they're putting others at risk.
Hipkins says sneaking out of Auckland right at the beginning of a lockdown shows a lack of judgment.
Listen above as Neil Miller and Shane Te Pou discuss the day's news with Heather du Plessis-Allan on The Huddle