Poland's prime minister Beata Szydło has said Poland wants Britain to stay in the EU, and her cabinet supports some of its demands for reform.
We fully support the prime minister's proposals regarding solutions that are aimed at improving competitiveness, removing red tape and granting proper significance to national parliaments.
Ms Szydlo also said she saw a need to discuss the question of welfare benefits for Polish citizens living in Britain.
In a joint statement, David Cameron said Britain wanted to see a "full strategic partnership between Poland and the United Kingdom".
The YouGov poll suggests 45% of Brits intend to vote for the UK to leave the EU despite proposed reforms published this weekRead the full story ›
David Cameron is today trying to finalise the details of his EU reform package.
The Prime Minister will meet EU counterparts at a London summit on the Syria crisis, before hosting European Parliament president Martin Schulz at Downing Street.
Despite the emergence of a draft deal on Tuesday, David Cameron is under pressure from some of his own Conservative MPs, largely over suggestions that MEPs could delay the introduction of a brake on migrant benefits for 18 months.
Yesterday, pressed on whether he had "compromised" on his election promises on the benefits brake by ITV News' Political Editor Robert Peston, the Prime Minister said it was "a negotiation".
David Cameron has promised to double UK aid to support Syrian refugees fleeing the brutal civil war.Read the full story ›
David Cameron was warned on Wednesday that as many as five of his own Cabinet ministers will be fighting for Britain to leave the EU.
Defending his draft deal, the Prime Minister admitted it was not perfect, but said it would make the British position "stronger and better".
ITV News Political Correspondent Libby Wiener reports:
The Prime Minister has declined to take a "very garish" anti-EU tie offered to him in the House of Commons.Read the full story ›
Ken Clarke has praised David Cameron on the EU reform proposals deal but said the Prime Minister "still has to deliver it."
Speaking in the Commons, Mr Clarke said: "The Prime Minister has actually achieved more on the big issues in this negotiation than I ever expected and I suspect more than hard-line Eurosceptics ever expected which is why they are denouncing it so fiercely but as he says he still has to deliver it."
Prime Minister David Cameron has said the EU reform proposals are an "important milestone in the reform, renegotiation and referendum."
Cameron reiterated the progress that had been made already in a speech to the Commons.
"This is a formal recognition of flexible Europe that Britain has long been arguing for", Mr Cameron said.