Brexit trade talks have plunged into crisis on the eve of a penultimate round of negotiations in London, after the United Kingdom warned the European Union it could effectively override the divorce deal it signed unless the bloc agrees to a free trade deal by October 15.

Tensions mounted on Monday, with chief EU negotiator Michel Barnier saying he was "worried" about negotiations, and he will seek clarification from London about plans to renege on commitments.

The UK is reportedly planning new legislation that will override key parts of the Brexit Withdrawal Agreement - a step that, if implemented, could jeopardise a treaty signed in January and stoke tension in Northern Ireland.

Sections of the internal market bill, due to be published on Wednesday, are expected to "eliminate the legal force of parts of the withdrawal agreement" in areas including state aid and Northern Ireland customs, the Financial Times newspaper said on Monday, citing three people familiar with the plans.

Al Jazeera's Nadim Baba reports.

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