British Prime Minister David Cameron and German Chancellor Angela Merkel have stressed that "more work" was needed to strike a deal on reforms to the European Union ahead of London's in/out referendum.

The two leaders spoke by telephone, also discussing Europe's migrant crisis as well as Syria's conference to be hosted by London next week, according to a statement from Cameron's Downing Street office.

Cameron has said he wants to land a deal on four key reforms with his fellow EU leaders at next month's European Council so that he can campaign to stay in the bloc ahead of a referendum on membership, which he has promised to hold by the end of 2017.

"On the UK renegotiation, they agreed that there had been progress since December's European Council and that there was genuine good will across the EU to address the British people's concerns in all four areas," added the statement.

The two leaders also discussed Syria conference to be held in London next week and will be attended by high-level officials from various world countries. The conference is expected to address increasing the financial aids for the Syrian refugees.

Source: MENA