May will gather several of her ministers later on Thursday as part of routine meetings to keep her cabinet team updated on progress in Brexit talks.
The meeting takes place against growing criticism over her plans to leave the EU with some Conservative eurosceptic lawmakers saying they will vote against any deal based on her so-called "Chequers" proposal, named after her country residence.
Former prime minister John Major, whose career as leader was crushed partly by eurosceptics, said the behaviour of some of those Conservatives was "an intolerable way to treat a prime minister who's in the middle of negotiations".
But the parliamentary arithmetic is difficult for May. With the support of the DUP she commands a majority of only 13 lawmakers and needs to keep either her own party onside or attract votes from the main opposition Labour Party.
Labour leader Jeremy Corbyn has said the party will vote against any deal that does not meet its tests - something the Chequers plan does not fulfil.
And former Labour leader Tony Blair added his voice to calls for the party to vote down May's Brexit divorce deal.
"My view is this only happens if there is blockage in parliament. But if there is blockage in parliament it is a very simple argument. You say look we have been two and a bit years trying to reach an agreement that works, parliament is blocked."
