All EU leaders want the UK to stay in the bloc and a Leave vote will be met with dismay and anger across the Channel. EU leaders will probably convene an emergency summit, probably as early as the weekend, the BBC informs.
What will happen is difficult to predict. There has already been talk of other EU leaders offering fresh concessions in an attempt to keep the UK on board although both Leave and Remain campaigners have dismissed this, saying the will of the British people must be respected.
And given Mr Juncker - the president of the European Commission - has suggested that "splitters will not be welcomed back with open arms", the atmosphere could become quite toxic quite quickly.
Europe's leaders, concerned about the rise of populist anti-EU parties in their own countries, will want a joint declaration of a determination to continue - and there will be demands for the UK to set out where it stands on key issues such as free movement, to reassure the 2.9 million EU citizens living in the UK that they will not be deported.
