Prime Minister Boris Johnson will tell French President Emmanuel Macron and German Chancellor Angela Merkel that the British parliament cannot stop Brexit, The Sunday Telegraph newspaper reported.

"This week, Mr Johnson will travel to Germany and France to insist to Emmanuel Macron, the French president, and Angela Merkel, the German chancellor, that Parliament cannot stop Brexit," the newspaper said.

"Johnson is expected to tell them that they have two months to agree a deal acceptable to the cabinet and parliament, without which the UK will exit without an agreement on Halloween," the paper said.