Manser left The Ritz last week to 'take time out for family reasons'.
Sales and marketing director Ruth Jones has been handed responsibility for the press and PR function while efforts to find a replacement are made.
Jones said that, because of Manser's 'quick' departure, attempts to find a replacement were still at a very early stage.
Manser leaves after three years in the position as the sole PR practitioner representing the luxury hotel. Jones said no other in-house or external resources were used, but added that agencies had been used on project work in the past.
The eventual appointee will report to Jones, with responsibility for managing the external reputation of the hotel.
The Ritz opened in 1906 and has been a feature of Central London's hotel scene ever since. In recent years it has undergone a multi-million pound refurbishment to restore it to its former glories, and support its positioning as one of the world's elite hotels.
The hotel is a member of the 'Leading Hotels In The World' marketing group, which comprises independent five-star hotels worldwide and acts to assist their efforts to drive sales.
In April the New York-based group reported the first upturn in the financial fortunes of elite hotels following the post-11 September slump in revenues.
The Ritz building, on the edge of Green Park, boasts 113 guest rooms and 20 suites. It includes the Ritz Club, which offers gambling and casino facilities, and two restaurants - the Ritz Restaurant and the Palm Court.