"It is not for us to say what the British people should be doing," he said. "Economically, it would be bad news, bad news for the United Kingdom, as well as the world, not just Europe. That would trigger capital transfers as well as the relocation of some activities that would not be for the benefit if the United Kingdom or even for Europe."
The G7 statement follows comments from the International Monetary Fund that there were no economic positives to Britain leaving the EU, while the Bank of England has said the economy would slow sharply, and possibly even enter a brief recession.
The Organisation for Economic Co-operation and Development has also warned that British voters risk paying a "Brexit tax" equivalent to a month's salary by 2020 if they leave the EU.
