Tourists travelling to Greece have to register 48 hours prior departure
Beginning July 1, 2020, the Greek government has determined how the country will welcome travellers, carry out the necessary diagnostic screening and keep everyone safe throughout the season.
The Passenger Locator Form (PLF) is a key element in the planning. All travellers are obliged to complete their PLF at least 48 hours before entering the country, providing detailed information on their point of departure, the duration of previous stays in other countries, and the address of their stay while in Greece.
All passengers must comply with all of the necessary preventive hygiene measures (use of masks and physical distancing).
More info and form can be filled on this official website:
https://travel.gov.gr/#/