There will be an opportunity after the general election for the British people to give "fresh consent" to UK membership of the European Union, Prime Minister David Cameron has said.
It is the strongest indication yet from Mr Cameron that he may be ready to call a referendum on EU membership, if returned to power.
The Prime Minister said he believes remaining in the EU is in Britain's interests.
Speaking in a round of TV interviews during his visit to Brazil, the PM said: "I don't think it is in Britain's interests to leave the EU but I do think what it is increasingly becoming the time for is a new settlement between Britain and Europe, and I think that new settlement will require fresh consent.
"In the next parliament, I think there will be opportunities for a fresh settlement and for new consent to that settlement. There is a reason why. The euro is a currency with 17 different countries. I think, increasingly, one currency will mean one economic policy.
"They are going to change and that will give us opportunities for changing our relationship with Europe.
"I argue for Britain's membership because I want to be able to say to countries like Brazil 'Come to Britain and you can sell to the 320 million consumers across Europe'.
"I argue for Britain's membership because I think it is in our interests. If I didn't think it was in our interests, I wouldn't argue for British membership."