Britain gave official notification that it would leave the European Union at the end of March, meaning it will leave the bloc, which is its biggest trading partner, in March 2019.
Britain said on Friday that no deal could be struck on exiting the European Union unless the future relationship with the bloc was taken into account.
Her spokesman said Britain would not change its stance on Brexit, though May told her lawmakers she would seek a broader consensus in the party on her approach.
"As we also said in our Article 50 letter, "agreeing a high-level approach to the issues arising from our withdrawal will of course be an early priority". As the European Union has itself said, "nothing is agreed, until everything is agreed".
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Philip Hammond, Britain's finance minister, says protecting the British economy should be the main objective of upcoming negotiations over the country's exit from the European Union.
He wouldn't be drawn on whether he supported Britain's continued membership in the single market and said May's minority government will negotiate in a "pragmatic" manner, striving for a solution that works for both sides.
"I'm not going to give a blow by blow account of how we propose to take that discussion forward", he said.
UK Prime Minister Theresa May had hoped to enter negotiations with a strong bargaining hand, but the recent snap general elections have left her without a majority in Parliament and mired in talks between her Conservative Party and the minor Democratic Unionist Party of Northern Ireland in a bid to achieve a ruling pact.
"As we enter negotiations next week we will do so in a spirit of honest cooperation, taking a pragmatic approach to trying to find a solution that works both for the United Kingdom and European Union 27". "We want to end the anxiety facing 4 million citizens".