French president Emmanuel Macron has indicated he will not allow an extension to Brexit talks, putting pressure on British members of parliament who must decide whether to accept a deal with the European Union or risk leaving the bloc without any transition arrangements.

A vote will be held in a special sitting of the UK parliament on Saturday on whether to accept a deal secured from Brussels by the country's prime minister, Boris Johnson. If they say no, Johnson will be obliged to ask EU leaders for more time to find another solution. However, Macron, like the other 27 European leaders, has the right to deny this, putting the UK on a path to crash out of the EU on October 31 without any adjustment period.

"I am not trying to read into the future, but I do not think we shall grant any further delay," Macron told journalists after a meeting in Brussels. "It is a time to put an end to these negotiations and move on to the future relationship."

He added that only "major changes" would lead him to shift his position on the issue.

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The comments will help Johnson by raising the stakes for politicians hoping to reject the deal in favor of a better arrangement. Johnson has repeatedly insisted Brexit must happen at the end of October.

Who must Johnson persuade?

Johnson says he is "very confident" the renegotiated deal will be passed by the House of Commons, but the vote on Saturday is likely to be tight.

The Labour Party, Liberal Democrats and Scottish National Party oppose the deal and it has so far failed to receive the backing of the Democratic Unionist Party's (DUP) 10 MPs. The Northern Irish party fears the revised agreement could lead to the region being treated differently from the rest of the UK.

Around 320 votes will be needed for a majority, and independents, Brexit-friendly opposition MPs and hardline Conservatives are weighing their options. 

Brexit hardliners in Johnson's Conservative Party had previously said their support is contingent on the DUP also voting for the agreement, though some have peeled away from that position.

Conservatives MPs who vote against the government could be threatened with losing the party's whip in parliament, part of a carrot and stick approach that could also see the 21 MPs expelled from the parliamentary party in September offered a way back in exchange for backing the deal.

Johnson will also need to persuade some Labour MPs, and is expected to try to allay concerns about workers' rights to win over opposition lawmakers.