Mr Hamyln, also known as Miguel Williams, has been missing for almost three weeks.

His phone was traced to Victoria, but no one has heard from the 20-year-old.

Revelations of a possible sighting in the state’s East come on the eve of National Missing Persons Week.

“Police believe Michael may have been in the Perth area around midday on (July 10) and then possibly the Fingal Valley area later that evening,” Tasmania Police said in a statement on Friday.

Anyone with information should contact police on 131 444.