The man, aged in his 60s, was a passenger on the Ruby Princess cruise ship and had stayed in Sydney after becoming unwell.

He is being monitored by NSW health authorities.

As he is a resident of the Territory, the man's diagnosis will be recorded in the NT's COVID-19 statistics.

A Territory couple who disembarked from the Ruby Princess cruise ship in Sydney and flew to Darwin tested positive to COVID-19 late last week.

The ship had docked in Sydney last week after sailing from New Zealand.

The infections only became public 24 hours after the ship docked.and although some passengers displaying flu-like symptoms while aboard, four COVID-19 detections were not known until well after passengers disembarked.

This brings the official number of NT residents diagnosed with COVID-19 to six.

The other detection in the NT was a Sydney tourist who was quarantined at RDH.

There are no additional cases of COVID-19 in the Northern Territory community.

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