Talks have taken place between management and unions representing French workers, who are unhappy with working terms and conditions.
But with crossings suspended indefinitely, Brittany Ferries is only able to advise passengers to travel to Dover or Calais and use alternative ferry companies to cross the Channel.
Brittany Ferries has said that P&O Ferries and MyFerryLink have agreed to accept Brittany Ferries tickets between Calais and Dover.
You do not need to contact Brittany Ferries, all you need to do is present your booking reference at check-in to travel with P&O Ferries or MyFerryLink free of charge.
A link between Poole and Cherbourg, which is operated on Brittany Ferries' behalf by Condor Ferries, is still running but with very limited availability.
There is no space from Cherbourg to Poole and limited space from Poole to Cherbourg from this Thursday until Sunday when the service ends.
Passengers currently booked on these sailings are unaffected.
Brittany Ferries contact details:
Telephone: 0870 333 1101
Monday - Friday: 08:30 - 19:30
Saturday: 09:00 - 17:00
Sunday: 09:00 - 16:30
Chris Newey, passenger director for the English Channel at DFDS Seaways, comments:
"In light of the recent cancellations by Brittany Ferries, we are now accepting all car passengers with valid Brittany Ferries tickets on our DFDS Seaways cross-Channel ferry routes. That includes both the Dover to Dunkirk and the Dover to Calais services.
"We would like to advise any car passengers with valid Brittany Ferries tickets for their cancelled routes, who would like to travel with us to between Dover-France, that they simply need to present their tickets at the check-in booths and we will accommodate them on the next available service."
For up-to-date information on DFDS Seaways’ sailing times, passengers can visit www.dfdsseaways.co.uk or telephone 0871 574 7241. DFDS Seaways sails from Dover to Dunkirk and Dover to Calais, up to 44 times a day.