MPs are expected to be summoned to the Commons for a special Saturday sitting, following next week's crucial EU summit.
Government sources said MPs would be called back to Westminster on October 19, regardless of whether Boris Johnson has been able to secure agreement on a Brexit deal.
The Brussels summit takes place on October 17 and 18, and will be the last scheduled meeting of EU leaders before the October 31 Brexit deadline.
If the Prime Minister is able to get an agreement, it will be an opportunity for MPs - who will have to give their approval - to debate it.
Otherwise, Mr Johnson is expected to set out how he plans to take Britain out of the EU at the end of the month with no deal.
However, under the terms of the so-called Benn Act, he will be required by law to seek a Brexit delay if he is unable to get the backing of MPs for a deal or no deal exit on October 19.
While the Prime Minister insists he will abide by the law, he has also been adamant that the UK will leave on October 31 "do or die".
Mr Johnson is expected to meet with the Irish Premier Leo Varadkar today in an attempt to discuss the Northern Ireland backstop, which continues to stand in the way of an agreement.
But Mr Varadkar has warned it will be "very difficult" to come to an agreement in time for the EU summit.