President of the European Council Donald Tusk has confirmed all EU leaders have reached an agreement with Turkey's prime minister to curb the migration crisis.
The new arrangements could come into force as soon as Sunday after a revised deal was reached between Turkish PM Ahmet Davutoglu and European Council president Donald Tusk in Brussels.
The European Union and Turkey have sealed a deal to return migrants arriving across the Aegean to Europe, Lithuanian President Dalia Grybauskaite said on Twitter.
She said a "test of implementation" is due to start on Sunday.
The agreement involves closing the EU border on March 20 and sending back migrants who arrive in Greece after that date to Turkey.
Cameron asks EU leaders to back deployment of more international patrol ships close to Libyan coast in bid to deter migrant smugglers.
David Cameron will tell his European colleagues that the migration route from Libya to southern Italy is about to begin once more.