Victorian authorities are investigating whether a positive COVID-19 case who travelled to Australia from a country of concern had any close contacts while visiting the state.

A department of health spokesperson said on Sunday night investigators would be speaking to the NSW case tonight after it emerged the person arrived in NSW then made a trip to Victoria before returning to the NSW.

No returned travellers in Victoria from countries of concern have tested positive.

Attributable to the Victorian Department of Health:

Returned travellers to Victoria from countries of concern have been tested, and only negative tests have been received so far.

Victoria is also aware of a case who has returned to Australia from a country of concern and tested positive in NSW.

The case travelled to Victoria from NSW and subsequently returned to NSW.

Victorian health officials will complete a full interview with this case tonight.

The Department of Health will communicate directly with identified contacts to provide advice - and may also provide this advice publicly if needed.