Britain is better off to stay in the European Union, European Commission President Jean-Claude Juncker said on Tuesday that he will soon be fully acquainted with London's demands regarding the 28 Oris block reform.

"I believe that the European Union is better with Britain and Britain is better within the EU. I also believe that key areas can do much more collectively than anyone for ourselves, "Juncker wrote in The Times.

British Prime Minister David Cameron has said that he will send a list of reforms that his government expects from the EU early in Brussels, before recommending that his constituents refer to a Union that they will convene within two years.

Juncker, former Luxembourg prime minister whose nomination at EC head Cameron tried to block, said he had promised "a fair deal with Britain," and that he would "pragmatize" in new negotiations.

Citing a slow-moving economy, the Greek debt crisis, Islamist attacks in Europe, migration and insecurity in neighboring regions, Juncker said he "believes that these burning issues of the European nation must work together to find common solutions."