Boris Johnson will decide whether to walk away or continue with Brexit negotiations after this week’s European Council summit, Downing Street has said.
Number 10 said progress has been made in discussions over the last few days – primarily in technical areas – but that differences still remain, namely over fishing rights.
The Prime Minister will speak to European Commission president Ursula von der Leyen and European Council president Charles Michel on Wednesday evening.
Mr Johnson has previously said he wants to know if a trade deal is possible by Thursday, when the leaders of the 27 EU countries meet in Brussels.
The spokesman told a Westminster briefing: “Some progress has been made this week, primarily in technical areas of the negotiations, but there are still differences, with fisheries being the starkest.
“We need to get the substance settled and not having a common text to work from has made progress doubly difficult.
“The Prime Minister’s September 7 statement was very clear about the significance of October 15.
“He will need to take a decision on next steps following the European Council in the light of his conversation with President von der Leyen, and on advice from his negotiating team.
“I cannot prejudge what that decision will be.”
It is thought likely that a decision will be made on Friday.
Mr Johnson’s Europe adviser Lord Frost is taking part in negotiations in Brussels until the eve of the summit.
In an invitation letter to council members, Mr Michel wrote: “It is in the interests of both sides to have an agreement in place before the end of the transition period. This cannot, however, happen at any price. The coming days are decisive.
“I will invite our negotiator to update us on the latest developments. Key issues include, in particular, the level playing field, fisheries and governance.”
Mr Johnson said in September that there “needs to be an agreement with our European friends by the time of the European Council on October 15 if it’s going to be in force by the end of the year”.
He added: “So there is no sense in thinking about timelines that go beyond that point. If we can’t agree by then, then I do not see that there will be a free trade agreement between us, and we should both accept that and move on.”
The transition period, which kept the UK aligned to the EU’s single market and customs union rules to allow trade to flow smoothly after Brexit, is due to expire at the end of the year.