Discussions are to begin on a Brexit transition period and on how to enforce the divorce treaty, while ensuring there is no hard border with Ireland. The UK will also set out its ideas for security and customs arrangements.
EU chief negotiator Michel Barnier will start discussions in London, meeting with Brexit Secretary David Davis.
Several Conservative party lawmakers took to the airwaves to show their support for Theresa May, who remains under pressure from Brexit hardliners who fear she is diluting her plans for a clean break with the EU.
In a BBC interview, Interior Minister, Amber Rudd said Britain will not "surrender" in its fight to win a bespoke deal that would offer tariff-free trade as well as control over immigration.
She also tried to play down deep divisions in government, saying there was more unity than so-called Brexiteers thought.
February will also see Theresa May giving details on what kind of free trade agreement Britain wants. And she'll need to make her mind up quickly, as if she takes longer, the proposals won't make it in time for the March EU summit and the already tight timetable could slip.