Top-level talks aimed at finding a way out of the Brexit deadlock will continue between the government and Labour on Friday.
The discussions are taking place as Theresa May faces a week of hectic diplomacy as she battles to keep her EU withdrawal agenda on track.
The dialogue with Labour comes amid reports that EU officials are considering offering the prime minister a flexible extension - or "flextension" - to the Article 50 timetable.
European Council president Donald Tusk is preparing to put the option to EU leaders at a crunch summit next Wednesday in a bid to prevent the UK from leaving without a deal, according to the BBC.
As government talks with Labour on EU withdrawal went into another day, the issue of a new Brexit referendum continued to be a focus of attention.
It is understood the government could set out proposals to Labour leader Jeremy Corbyn in a letter on Friday.
This comes as the House of Lords debated a Bill aimed at extending the Brexit process in a bid to avoid a no-deal scenario.
The remaining stages of the European Union Withdrawal (No.5) Bill will be considered by peers on Monday.
The Bill, brought forward by backbenchers including Labour's Yvette Cooper, allows parliament to determine the length of any Brexit extension the prime minister should request at the EU summit on April 10.
If the European Council proposes a different extension, Mrs May would be required to return to the Commons to obtain MPs' approval.