David Cameron will begin crucial talks with EU Council President Donald Tusk as he seeks greater powers to control in-work benefits for migrants coming to Britain.
The Prime Minister will push for an "emergency brake" on benefits that can be applied immediately after the EU referendum.
Brussels has offered the power to halt migrant payments for up to four years if it can be proved that public services are under excessive strain from immigration. The move would need to be approved by other member states.
The proposal was deemed "not good enough" by Cameron and the pair will meet at Downing Street on Sunday evening and seek to hammer out a deal ahead of the European summit on February 18 and 19.
Immigration is one of the key issues of renegotiating Britain's membership of the EU.