The Prime Minister will meet the German Chancellor Angela Merkel later today to push for his demands for reforms of the European Union.
Earlier this week, Mr Cameron said he was "sure" there would be treaty change in Europe.
"I'm absolutely convinced that there will be the need to reopen at some stage these treaties, not least to solve the problem of the eurozone".
Mr Cameron was also due to meet French President Francois Hollande on Monday but pulled out of the meeting, following the death of Baroness Thatcher.
More top news
Andreea Cristea's partner Andrei Burnaz was due to propose to her on the day she was pushed by a car into the river Thames.
ITV News reveals new details of how claims of misbehaviour at British Cycling were all but ignored despite being uncovered over years ago.
Travis Frain is recovering in hospital and has posted a photo to Twitter of Prince Charles by his bedside.