MPs will be called to Parliament for a special Saturday sitting in a decisive day for the future of Brexit, BBC reports.
Parliament will meet on 19 October after a crunch EU summit - seen as the last chance for the UK and EU to agree a deal ahead of 31 October deadline.
If a deal is agreed, Boris Johnson will ask MPs to approve it - but if not, a range of options could be presented.
The BBC's Laura Kuenssberg says these could include leaving without a deal, and halting Brexit altogether.
MPs will have to agree a business motion in the Commons for the sitting to take place.
Assuming they do, the additional day would coincide with an anti-Brexit march run by the People's Vote campaign, which could see thousands of protesters heading to Westminster.
