Major port improvement work next year will mean there is only one ramp available for all ferries to use.
Work to improve the Port of St Malo will involve deepening and widening access and modernising the berths and ageing Naye terminal.
The multi million euro project has been delayed but now looks to go ahead.
This will mean Brittany Ferries is competing for space with other operators on the one ro-ro ramp that will be in use while the work is carried out.
The head of Guernsey's Economic Development Committee, deputy Sasha Kazantseva Miller, has been in discussions with the French authorities this week:
"I have been in communication with Stéphane Perrin-Sarzier, vice president of the Brittany Regional Council, who has responsibility for the Port of
Saint Malo.
"I welcome his confirmation that decisions regarding future port access for 2026 have not yet been finalised, ensuring that negotiations can continue.
"Brittany Ferries has a long-established presence at the Port of Saint Malo and a historic route to Guernsey spanning more than five decades, having taken over the service previously operated by Condor Ferries.
"I am confident that the Saint Malo Port Authorities and the Regional Council of Brittany fully recognise their social and economic responsibility to maintain connectivity for Guernsey and the UK, and that these factors will be central to their decision-making process.”

Possible job cuts at RBSI in Guernsey and Jersey
Guernsey students beat England's A level pass rate
Guernsey community unites out west for solar eclipse
19 months of traffic lights on busy Guernsey road
New Dean of Guernsey has Alderney connections
Guernsey's youngsters concerned by the high cost of living
A solar eclipse and meteor shower over Guernsey tonight
Average Guernsey home selling for more than £600,000