"The Ministry of Health in New Zealand is investigating a positive test result in a person who recently travelled from overseas and completed their 14 days of isolation in a facility in Auckland, before later developing symptoms," NSW Health said.
"People who arrived in NSW from New Zealand between Thursday, January 14 and Sunday, January 24, have been asked to check these venues of concern and, if they have been to any, to follow the associated health advice.
"They are also asked to monitor for even the mildest of symptoms and get tested and isolate if they feel unwell, then remain in isolation until a negative result is received – in line with routine advice for everyone in NSW."
New Zealand travellers are permitted to enter NSW without undergoing 14 days of hotel quarantine due to "travel bubble" arrangements.
Meanwhile, for the eighth day in a row, NSW has recorded zero locally acquired cases of Covid-19 in the 24 hours to 8pm last night.