But Mayo & Calder, organisers of the Auckland stopover, said they had been informed of the decision less than 24 hours ago, and as the event was still 17 months away any concerns from race officials were unjustified.
"Preparations for the Auckland stopover are well advanced and we have been working with our investment partners in the New Zealand Government and Auckland Council agencies to ensure all appropriate contingencies are in place to allow a successful stopover in 2023," Mayo & Calder said in a statement.
"This has been communicated repeatedly to race organisers, with no requests made or assurances sought with regard to New Zealand's Covid-19 response over this time.
"The Auckland stopover is at the heart of The Ocean Race and is its spiritual home. For almost 50 years Kiwis have given the race and teams a welcome like no other and it would be a slap in the face of supporters around the world if race organisers don't resolve this situation appropriately.
"In conjunction with our legal advisors and with the support of our investment partners we are now focused on working with the race organiser to achieve a satisfactory resolution to this disappointing situation."
The Ocean Race chairman Richard Brisius said New Zealand remained important to the future of the race and organisers would plan to return to Auckland in subsequent editions.
"We consider Auckland to be a spiritual home for this event, with legends like Sir Peter Blake, Grant Dalton, Ross Field and Mike Sanderson, to name just a few among so many of the amazing Kiwis who have taken on this challenge," he said. "Their legacy is woven into the fabric of The Ocean Race."