Labour is moving closer to supporting a second Brexit referendum and may officially back one as soon as this week, senior members of the party have said.
With the UK due to leave the EU on March 29, Theresa May is still seeking to negotiate changes to her Brexit deal with Brussels to secure the backing of MPs.
Labour leader Jeremy Corbyn has so far insisted the option of a second referendum remains "on the table" if the Government fails to secure a deal that can break the impasse in Parliament.
Mrs May has promised Parliament the chance to vote on the next steps on Brexit this week and MPs are set to put forward a series of amendments, including one saying her deal should be put to a referendum.
Asked whether this would be the week Labour comes out in support of a second referendum, the party's deputy leader Tom Watson told the BBC's Andrew Marr Show: "It might be... we are getting closer to that point."
"We are heading in that direction but there is still more play in the day's ahead," he added.
Shadow chancellor John McDonnell made similar comments in an interview with BBC Radio 5 live's Pienaar's Politics, while shadow international trade secretary Barry Gardiner told Sky News the prospect of a second vote was an important "safety net" as Britain edged closer to no-deal.
Mr McDonnell said: "In Parliament I think what's happening is there's (an) increasingly large number of people who will consider now moving towards a public vote situation to block a no-deal and to block a bad deal, that Theresa May's deal is."
"Going back for a public vote now is increasingly on the agenda to break the deadlock but also to prevent no deal,” he added.
"We've always said if we can't get a deal that (would) protect jobs and the economy we have to go back to the people and that's what we'll have to do if that's the case this week."
Mr McDonnell said he had met with Labour MPs Peter Kyle and Phil Wilson, who have proposed Mrs May's deal be put to the public in another referendum.
However he said he did not think enough Labour MPs would want to vote for the proposal as it stands because it would involve backing the Prime Minister's Brexit agreement.
"We're working with them to see can we have a redraft of that amendment which people could vote for. I think there's a high possibility we could," he said.
Mr Wilson told The Sunday Times he had also held talks with some of Mrs May's ministers to gain their backing for his second referendum amendment.
