The Economist Intelligence Unit (EIU) said that it predicts that United Kingdom prime minister Theresa May's government will lose Tuesday's "meaningful vote" on the withdrawal agreement and political declaration negotiated in November and therefore be forced to ask for an extension on Article 50.
With just two days to go before the Commons vote on her Withdrawal Agreement, she pleaded with parliamentarians to "do what is right for our country" and back her deal.
It came as four Tory Brexiteers announced their support for Mrs May's Withdrawal Agreement, despite suggestions they could vote against it.
Addressing workers at a factory in Stoke, where 69.4% of voters backed Leave, the prime minister will also say that if the referendum result is not honoured, people's faith in politics will suffer "catastrophic harm".
Theresa May is preparing to put her Brexit blueprint to a vote in the House of Commons next week with former Brexit minister Dominic Raab saying Britain should be prepared to leave with no arrangement in place.
"I think it's now looking much less likely that parliament would allow a no-deal outcome anyway", said Mr Hunt.
"We all have a duty to implement the result of the referendum".
At the heart of the coup are a group of cross-party backbenchers who are attempting seize control of Brexit from the Government and may even try to stop a WTO exit, suspend Article 50, or even to prevent the United Kingdom from leaving the European Union altogether.More news: Israeli Airstrikes Pound Warehouse at Syria's Damascus Airport
Not a prayer: British Prime Minister Theresa May, here leaving a church service in her Maidenhead constituency yesterday, is expected to fall well short in the crucial vote on her Brexit deal. If they fail, an election would be called.
Britain is set to leave the European Union on March 29 but has yet to finalise the terms of its departure.
He used an article in the Sunday Telegraph to urge MPs to vote down Mrs May's "bad" deal to send a message to Brussels that the United Kingdom "will not be bullied". A narrower defeat and the bloc may look at fresh ways of making the agreement more palatable to get it across the line in Parliament.
Jeremy Corbyn has said if Mrs May lost Labour would trigger a confidence vote "soon". but reports claim one group of rebels is plotting to give MPs control over the process instead. Senior ministers are also said to be urging May to seek a joint plan with the opposition Labour Party, raising the possibility of a significantly softer Brexit.
Those opposed to the clause argue it could tie the United Kingdom into the EU's orbit indefinitely.
Danielle Haralambous, UK analyst at The EIU, says: "Time is simply running out, and we're at a stage where Brexit can probably only happen in late March now in the unlikely event that parliament approves Mrs May's deal on January 15th, or if parliament supports leaving without a deal".
Despite her forceful words, May is likely facing a defeat - her bill is unpopular with both pro and anti-Brexit MPs.
Corbyn added: "I think you will find that when you get into serious negotiations as a government, determined to have that good relationship with Europe, that there will be an ability to negotiate".