"Although it could be possible to play competitions and matches outside of Auckland and Coromandel if the Covid alert levels fell to Level 2 before Saturday, with Level 4 restrictions not being lifted until midnight Friday at the earliest, we believe the responsible decision is to make an early call and keep people away from our fields and venues this weekend.
"We understand this decision will be disappointing for some of our stakeholders but [we] are confident the rugby community will once again act in unity to play our part in keeping Aotearoa safe."
NZR's decision means round three of the NPC, the opening round of the Heartland Championship, and rounds six and seven of the Farah Palmer Cup championship and premiership will now be played at a later date in the competition.
Rescheduled match timings will be confirmed as soon as possible.
Lancaster said NZR would review the status of all competitions beyond this weekend after the Government's next Covid update on Friday 20 August.
"Like all New Zealanders we will be guided by the Government and health authorities over the next seven days."