Hans-Olaf Henkel, vice-president of the European Parliament’s third-largest group the European Conservatives and Reformists, said Brexit was a “big disaster” that Mr Juncker was ignoring.
European Commission president Mr Juncker delivered his much-anticipated State of the Union speech on Wednesday with a snub to Britain by insisting the EU will move towards greater integration despite Brexit.
But, speaking to Express.co.uk, Mr Henkel said the UK’s decision to leave the Brussels bloc would be just as bad for the EU as Britain.
He said: “He called it a full vision of Europe. I must say, it was more a fools’ vision of Europe because he seemed to have totally ignored the realities of Europe.
“He somehow implied that Brexit would be a new opportunity for Europe.

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“First of all, this is a big disaster. Not only for the UK, it is at least as difficult for the European Union and he has ignored that fact very much.
“By the way he has also ignored his own responsibility for the Brexit because I noticed that the speeches of Farage or Johnson, who were fighting for Brexit, they could always refer to Juncker, Verhofstadt, more Europe and so on.
“Instead of taking the lesson and reversing the trend, he is on the same track so he risks losing more countries.”
Mr Juncker, who began speaking at 8am this morning, set out his 12-month masterplan to steer the troubled bloc through the escalating refugee crisis and reform the eurozone.
Keen to push ahead with his masterplan, billed as the biggest reboot in the EU’s history, Mr Juncker ratcheted-up the federalisation of the 60-year-old bloc’s core economies.
The Brussels boss has also called for EU integration in the face of rising populism after Britain voted to sever ties with the bloc ahead of crunch elections in Italy, Sweden, Hungary and the Czech Republic, where eurosceptic parties are gaining momentum.
It appears Jean-Claude Juncker is keen to make his mark in the EU as his five-year term as European Commission president expires in 2019 with a grand masterplan to rebuild the bloc, left in tatters after Britain’s momentous decision to leave.
Mr Juncker this morning announced the European Commission would begin negotiations with Australia and New Zealand for new trade deals.
Former Ukip leader Nigel Farage called the EU chief’s plans to hugely expand the powers of the European Union without a vote “extremely worrying” and shouted: “Thank God we’re leaving! You’ve learned nothing from Brexit!”