Talks between the UK and EU have resumed, as the two sides make a final bid to reach a post-Brexit trade deal, APA reports citing BBC.
Disputes overfishing and business rules are continuing, but the UK government said the agreement was "still possible" with time in "short supply".
The EU mood was described as "gloomy" as chief negotiator Michel Barnier met UK counterpart Lord Frost in Brussels.
Prime Minister Boris Johnson will speak to European Commission President Ursula von der Leyen later.
The European Commission said the conversation was due at 1600 GMT.
If no deal is done and ratified by the end of the year, the UK and EU could introduce import charges on each other's goods.
The government faces an urgent question from Labour in the House of Commons later on how the talks are going.
The prime minister's spokesman said: "Time is obviously in very short supply. We are in the final stages, but we are prepared to negotiate for as long as we have time available if we think an agreement is still possible."
He added that the UK would still "prosper" if no deal was reached with the EU.
Asked when the cut-off point for a deal was, a European Commission spokesman said: "We are not going to speculate on a last-chance date.
"We are fully committed to substantial negotiations. We've always said and continue to say it's the substance that prevails over timing."
Earlier, Irish Foreign Minister Simon Coveney described the EU negotiating team's mood as "gloomy" and "downbeat".
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