A “lot more work” is required to get MPs to back Theresa May’s Brexit deal, Jeremy Hunt has said, amid uncertainty over whether it will be put to a vote for a third time this week.

The foreign secretary said there were “encouraging signs” that opponents of the deal were slowly coming round.

But he said another vote would only be held before Thursday’s EU summit if ministers were “confident” of victory.

A number of Brexiteers have signalled they will continue to oppose the deal.

Former foreign secretary Boris Johnson called for further changes to the terms of withdrawal, which the EU has rejected, while 22 Tory MPs have written to the Daily Telegraph saying that leaving without any agreement – known as a no-deal exit – on 29 March would actually be a “good deal” for the UK.

What’s the current state of play?

Although the PM’s plan is expected to be voted on for a third time in the coming days, the BBC’s political editor Laura Kuenssberg said the situation remained highly unpredictable.

She said it was “eminently feasible” the PM would delay a vote until after Thursday’s summit – at which European leaders will discuss a UK request to extend the Brexit process and delay the UK’s departure.

Last week, MPs rejected Theresa May’s deal for a second time – this time by 149 votes – and then backed plans to rule out leaving the EU without a deal.

They also voted in favour of an extension to the process – either until 30 June, if the deal is supported before 20 March; or a longer one that could include taking part in European elections if MPs reject her plan again.

All 27 EU member states would have to agree to an extension.

Ministers ‘redoubling their efforts’

The possibility of Brexit being delayed or overturned in another referendum has seen some MPs reluctantly back Mrs May’s deal.

A group of 15 Tory MPs from Leave-backing constituencies, including former Brexit Secretary David Davis, wrote a letter urging colleagues to back the deal to ensure Brexit goes ahead.

Speaking as he arrived in Brussels for a meeting of EU foreign ministers, Mr Hunt welcomed the fact “strong critics” of the deal were now prepared to support it in order to prevent the risk of “paralysis”.

“I think there are some cautious signs of encouragement,” he said. “But there is a lot more work to do…That is why we will be redoubling our efforts this week.”

Asked if a third vote would definitely happen before Thursday’s EU summit, he said he hoped it will but “we have to be confident we will get the numbers”.

Are Tory MPs changing their minds?

So far the number of Tories publicly switching positions falls far short of the 75 MPs Mrs May needs to switch sides.

John Baron and Priti Patel both told Sky News they would only considering supporting the deal if there were “11th hour changes” to the backstop – a fallback plan to avoid physical checks on the Irish border.

Writing in his weekly Daily Telegraph column, Mr Johnson warned the UK would be “humiliated” if there was not a radical change of approach, while Peter Bone told the BBC that leaving on 29 March remained the default position in law and was, in his opinion, the “favourite outcome”.