Post-Brexit trade deal talks are unlikely to be extended beyond Sunday without substantial movement from Brussels, the Foreign Secretary has said.

Boris Johnson and European Commission president Ursula von der Leyen held crunch talks over dinner in Brussels on Wednesday in a bid to break the deadlock, but both sides warned afterwards that “very large gaps” remain.

The pair agreed that a decision on the future of the negotiations will be taken by the end of the weekend.

Dominic Raab told the BBC on Thursday that, while he could not rule out a further extension in the talks process, it is important to have “finality”.

He said: “I think it’s unlikely but I can’t categorically exclude it.”

The Cabinet minister added that there has not been “enough pragmatism and flexibility on the EU side” and called for “substantial movement” from the bloc in order to seal a deal before the weekend is out.

Conversely, Mr Raab said the United Kingdom had shown “pragmatism” during the negotiations, but stressed the UK would not “sacrifice” its ability to control fishing waters and laws on standards to achieve a trade deal with the EU.

He said: “No other country would accept that and nor would the EU in terms of its dealings with third countries.”

“On the fisheries, we’ve accepted that there needs to be some sort of transitional period but we must be able to control access to our own waters.

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“We’ve agreed that we’d follow the EU’s approach to free trade deals with countries like Canada and Korea in relation to the so called level playing field requirements.

“What we’re not going to be treated… is in a way that no other country would accept, and nor would the EU accept.

“It’s about some basic respect for democratic principles.

“We’re ready to leave the transition period – we would much prefer a deal, no stone is being left unturned – but otherwise we’ll make a success of Brexit on Australian-style rules.”

Meanwhile, Stephan Mayer, a state secretary at Germany’s Interior Ministry, told BBC Radio 4’s Today programme that a no-deal outcome would be the “worst solution for both sides”.

And so UK and EU negotiators will begin a final push to salvage chances of a post-Brexit trade deal, with their chief negotiators Lord Frost and Michel Barnier to reconvene in Brussels later today.

In a statement following three hours of dinner and discussions in Brussels yesterday, a senior Number 10 source said it was “unclear” whether the differences between the two sides could be bridged.

They said: “The PM and VDL (von der Leyen) had a frank discussion about the significant obstacles which remain in the negotiations.

“Very large gaps remain between the two sides and it is still unclear whether these can be bridged.

“The PM and VDL agreed to further discussions over the next few days between their negotiating teams.

“The PM does not want to leave any route to a possible deal untested. The PM and VDL agreed that by Sunday a firm decision should be taken about the future of the talks.”

A Downing Street spokesman added that “any agreement must respect the independence and sovereignty of the UK”.

Mrs von der Leyen said the negotiating teams should “immediately reconvene” to try to resolve the “essential issues” but stressed the positions remained “far apart”.

She said in a statement: “We had a lively and interesting discussion on the state of play across the list of outstanding issues.

“We gained a clear understanding of each other’s positions. They remain far apart.

“We agreed that the teams should immediately reconvene to try to resolve these essential issues. We will come to a decision by the end of the weekend.”

It was hoped that progress at a political level between Mr Johnson and Mrs von der Leyen could pave the way for more talks between Lord Frost and Michel Barnier.

But the statements from both sides suggested that while further discussions would be held, substantial movement on the key issues had not been made.

Mr Johnson and Mrs von der Leyen discussed the potential trade deal over a three-course dinner featuring scallops and turbot.

Negotiations have faltered on fishing rights, among other issues, and the Commission’s menu will be seen as a pointed gesture by some but a sign that it has a sense of humour by others.

Other outstanding differences include the “level playing field” measures aimed at preventing the UK undercutting the EU on standards and state subsidies, and the way that any deal would be governed.

Before leaving London, Mr Johnson told MPs that no prime minister could accept the demands the EU is making, though insisted a trade deal was still possible.

Their meeting came ahead of a European Council summit on Thursday where Mrs von der Leyen is expected to debrief the leaders of the 27 member countries on the state of play with the negotiations.

Just three weeks remain until the current transitional arrangements expire.

Failure to reach agreement would see tariffs imposed on UK exports to the EU, the country’s biggest trading partner, and could also increase bureaucracy.

The Office for Budget Responsibility has suggested that a no-deal outcome could wipe 2% off gross domestic product, a measure of the size of the economy, in 2021.

The Bank’s governor Andrew Bailey has warned the long-term damage caused by a no-deal situation would be worse than the economic hit from coronavirus.