Asked by German newspaper Bild am Sonntag if other member states would follow the UK’s example in quitting, Juncker said: “No. Britain’s example will make everyone realise that it’s not worth leaving.”
He added: “On the contrary, the remaining member states will fall in love with each other again and renew their vows with the European Union.”
The EU’s 27 leaders plan to declare “Europe is our common future” during a meeting in Rome next week to mark 60 years of the bloc.
Juncker said Britain would need to get used to being treated as a non-member.