Marella Cruises has extended its cancellations of all cruises until 30 September due to the ongoing coronavirus crisis.
The Foreign Office has recently advised people not to take any ocean-going cruises.
Marella says that the only ship it will operate this summer will be Marella Explorer, which is due to sail from Corfu from 2 October.
All customers whose bookings are impacted by the above changes will receive a refund credit and up to 10% incentive of the total value of their booking, or they can request a cash refund via an online form on the TUI website.
Customers with bookings due to depart in October can amend their cruise for free before 31 July to any other holiday on-sale until October 2021. They will have to pay any difference in price, but there will be no admin fee, says Marella.