There is a "glimmer of hope" that a Brexit deal can be reached before Britain's departure due on Oct. 31, French Finance Minister Bruno Le Maire said on Wednesday.

"There is a glimmer of hope, from what I hear from the negotiators," Le Maire told Europe 1 radio, adding that protecting the European single market was the "red line" for France in Brexit talks.

Last-ditch talks between Britain and the European Union to get a deal ahead of a summit of the bloc's leaders this week went on past midnight to Wednesday, but it was still unclear if London could avoid postponing its departure.