Minister of Health Saia Piukala said the two Covid cases that led to the current lockdown are baffled by their infection reports Kaniva News.
Piukala said the duo did not recall any situation while working at the wharf that could lead them to believe a breach was responsible for their infections.
Piukala previously denied rumours that the source might link to the Australian helicopter carrier, HMAS Adelaide, which arrived in Tonga last week.
More than 20 of its crew have been infected and are self-isolating on board.
