Ministers were warned that the EU could impose tariffs and quotas on certain products if Boris Johnson rolls back the Brexit deal in a trade dispute over the sale of sausages.

Tensions are mounting ahead of a crucial meeting to resolve issues stemming from part of the deal, known as the Northern Ireland Protocol, on Wednesday.

The UK government is reportedly considering unilaterally extending grace periods under the protocol, giving Northern Irish businesses time to adjust to the new rules, including for the import of chilled meats such as sausages and the hash of Great Britain.

Grace periods are due to expire at the end of June, but according to the Telegraph Johnson plans to extend them amid lack of progress towards a new deal on around 30 issues relating to animal, property and medicine controls.

Maroš Sefčovič, a vice-president of the European Commission who is traveling to London on Wednesday to lead the negotiations on the Brussels side, wrote an article for the same newspaper in the run-up to the talks, warning that the EU would act “quickly, firmly and resolutely to ensure that the UK respects its obligations under international law ”.

Nathalie Loiseau, French MEP and member of the European Parliament’s UK coordination group, said the UK should “keep its commitments and implement them”.

Speaking to BBC Radio 4’s Today program, she said: “These rules have been accepted by the UK and they are easy to follow. It’s just that there are people to hire, IT people to update so that they can check the sanitary rules – just because your sausages aren’t exported, they go to Northern Ireland and they enter the market. unique.

Loiseau said Sefčovič warns that if the UK continues to violate protocol, tariffs and quotas designed to regulate the import of goods into the EU by raising the price and capping the number may be needed.

“We don’t want to achieve that,” she added. “But we warn – you signed an agreement, you have to implement it, otherwise we can take action that will protect our single market… The UK’s international reputation is at stake.”

George Eustice, the Environment Secretary, said there was an “outright ban” on sending chicken nuggets and sausages from Britain to Northern Ireland. “It’s clearly crazy,” he complained.

The UK has already “done a tremendous job” to address some issues arising from the protocol, Eustice said, accusing senior politicians in Brussels of being “quite slow so far”.

He added: “We will work with the EU to try to find solutions to this problem. “

It follows Northern Irish companies calling on both sides to end a Brexit ‘blame game’ and come up with urgent solutions to end growing tensions over controls on food and goods crossing the Irish Sea in the region.

The protocol has been hugely controversial in Northern Ireland, contributing to Easter violence and cracks in the Democratic Unionist Party, which is officially campaigning for its removal.