A state-of-the-art spa will be offered to passengers onboard Marella Explorer in May 2018.
The news follows the announcement of a partnership between luxury UK spa brand Champneys and the re-branded Marella Cruises.
The spa will pamoer with facials, massages, body wraps, acupuncture, manicures, as well as a wellness centre, salon and relaxation room.
Marella Explorer, which will be based in Palma, Majorca, is the biggest ship of the cruise line.
The announcement comes days after TUI appointed Christopher Hackney as the managing director of Marella Cruises. He takes up his position December 1.