EURO boss Jean-Claude Juncker faced fresh questions over his fitness for office last night as claims emerged he was drunk during a major UN peace summit.

Diplomatic sources have alleged that the EU Commission president was “very visibly p***ed” during key talks in Geneva recently over Cyprus.

9 Jean-Claude Juncker was accused of being 'very visibly pissed' at the UN summit in Geneva Credit: EPA

International leaders came together to try to end decades of stalemate over the Mediterranean island, split between Turks and Greeks.

Mr Juncker caused a stir during the conference with his drink-fuelled erratic behaviour. It included collisions with people and furniture, and being very familiar with junior aides.

A diplomatic source told The Sun: “It was clear Juncker was very well refreshed.

9 Sources at the peace summit claimed Mr Juncker was 'very well refreshed' and branded him 'a bit embarrassing' Credit: EPA

“He was bumping around into things, and going up to junior members of staff for conversations.

“It was odd behaviour, and a little bit embarrassing for everyone”.

The allegations are the latest in a long line to hit Mr Juncker over his drinking.

9 The EU boss is currently embroiled in a row with Prime Minister Theresa May Credit: Getty Images

The former Luxembourg premier and his scheming chief of staff, Martin Selmayr, are at the centre of a furious row after Theresa May.

The PM accused them on Wednesday of trying to interfere with the general election after they were suspected of being behind a series of damaging briefings about her Brexit preparations.

9 Mrs May accused Mr Juncker of attempting to interfere in the UK General Election Credit: Getty Images

MOST READ IN POLITICS Exclusive BOJO PLEA We need tough love to flatten 2nd camel-like Covid hump and save Xmas, says Boris Exclusive NO 'SNEAKS' Don't snitch on neighbours unless they're having 'Animal House parties' says PM FOLLOW THE RULES Boris hints at second lockdown if Brits fail to follow 'rule of six' Exclusive EU ARE 'ABUSIVE' Boris slams Brussels for failing to act in good faith over Brexit deal PM'S PLEDGE Boris to unveil £546m winter rescue package to fight off Covid-19 in care homes STOP THE SPREAD Tougher lockdown 'in 2 weeks' could include pub curfews if rule of 6 fails CAM BLUSHING David Cameron 'embarrassed' after MP's wife says he wanted to 'give her one' Exclusive 'WE'RE COMING FOR YOU' Priti joins raid on 'Head of the Snake' county lines drug gang boss TESTY TIMES Boris admits UK DOESN'T have enough coronavirus tests to meet spiralling demand Exclusive SCHOOLS OUT, AGAIN! 740 schools forced to send kids home over coronavirus testing shambles

The EU Council’s president Donald Tusk stepped in to call for calm.

In a clear slap down directed at Juncker and his big-mouthed staff, Mr Tusk tweeted: “Brexit talks difficult enough. If emotions get out of hand, they’ll become impossible. Discretion, moderation & mutual respect needed.

“At stake are the daily lives and interests of millions of people on both sides of the Channel."

9 As the Brexit row raged, EU Council President Donald Tusk called for calm in a slap-down directed at Juncker Credit: Getty Images

European Parliament president Antonio Tajani added: “No one is trying to influence the outcome of the election”.

But Mr Juncker’s office remained unrepentant, with a commission spokesman saying they are “‘too busy to engage in who said this and that”.

Mr Juncker’s latest drink-fuelled embarrassment came on January 12 this year, after he lead the EU’s delegation at the Cyprus settlement conference.

9 European Parliament president Antonio Tajani claimed 'No one is trying to influence the outcome of the election' Credit: Getty Images

Confronted by The Sun, the EU Commission refused he had drunk too much again.

A spokeswoman for Mr Juncker would only say: “We understand that the British press is in campaign mode but we will not dignify such insulting allegations with a comment”.

Former Tory MP and current candidate Jacob Rees Mogg said: “If someone has a serious drink problem, they deserve sympathy.

9 Former Tory MP and current candidate Jacob Rees-Mogg questioned whether Juncker was able to represent 28 EU countries Credit: PA:Press Association

“But behaviour like this from Mr Juncker is not compatible with representing 28 different countries. as he does.

“We must ask, it he really able to do his job?”

The Cyprus incident follows a notorious EU summit in Latvia in 2015, when a clearly inebriated Mr Juncker slapped a series of arriving EU leaders in the face in front of TV cameras.

9 My Juncker previously loudly branded Hungarian Prime Minister Victor Orban 'a dictator' before slapping him Credit: EPA

He also loudly branded Hungary’s PM Victor Orban “a dictator” as he arrived, before also slapping him in the face.

Critics of the arch-federalist have also claimed in the past that he drinks Cognac for breakfast.

A former senior aide to David Cameron, who fought regular duels with Mr Juncker, has also told The Sun that the ex-PM’s officials would always ensure any of their meetings were scheduled for before lunch.

9 David Cameron's former-aide claimed the ex-PM would ensuretheir meetings were scheduled for before lunch or they were 'not necessarily worth it' Credit: AP:Associated Press

The aide added: “Otherwise, they were not necessarily worth it”.

Scots Tory boss Ruth Davidson also this week accused the 62-year-old ex-Luxembourg premier of being a dishonest boozer.

On a smear briefing about a No10 dinner bust up last week, Ms Davidson said: “The idea that journalists would take tales that Jean Claude Juncker would tell after a good dinner as being an honest narrator is unusual”.

Brexit Secretary David Davis last night accused the European Commission row trying to "bully the British people" with its briefings in recent days.

Speaking on Question Time he insisted the Government had tried to be calm when the first "misleading briefing" was given about a dinner between Theresa May and Jean Claude Juncker last week.

But he said: "Then we had further briefings, 'we're going to have to pay 100 billion euros', 'Theresa May won't be able to take part in the negotiations'.

"The Commission was trying to bully the British people and the British people will not be bullied. The Prime Minister made the points she made and she was right to do so."