Celestyal is aiming to resume operations on 29 May from Athens with its seven-night Idyllic Aegean itinerary.
The restart is in accordance with the recently announced Greek Ministry of Tourism roadmap to opening Greece to tourism and cruising for the 2021 season.
The cruises on Celestyal Crystal, pictured, with prices from £549 per person, will call at Kusadasi, Rhodes, Santorini, Lavrion (for Temple of Poseidon), Mykonos , Milos and Crete.
Seven-night cruises will depart from Piraeus on a Saturday while shorter three and four-night itineraries will set sail from Lavrion each Wednesday.
Guests affected by cancellations have the option to receive a refundable Future Cruise Credit equivalent to 100 per cent of the amount paid plus an additional non-refundable bonus FCC equal to 20 per cent of the actual cruise fare paid.