Britain wants to change the rules governing the free movement of people across the EU, Home Secretary Theresa May will tell European ministers.
Mrs May will speak in Brussels, ahead of the lifting of movement controls on Bulgarians and Romanians.
She says free access to labour markets must not be allowed to lead to "mass migration".
However, some countries have already vowed to defend what they regard as a fundamental EU principle.
EU justice and home affairs ministers will meet in Brussels on Thursday.
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Mr Cameron has suggested that citizens from other EU countries would not be able to claim out-of-work benefits for the first three months in the UK and would not be able to extend claims beyond six months if they had no genuine prospect of work.
Laszlo Andor, a European commissioner, angered Mr Cameron by commenting that the UK was at risk of becoming a "nasty" country if it curbed benefits and sought to limit freedom of movement by EU nationals.
http://www.bbc.co.uk/news/uk-politics-25226760
