Robert McCoy, 67, from Liverpool is a former financial controller of the Committee of the Regions.
He alleges that he was harassed for several years by Brussels bosses because he refused to alter figures for the EU regional assembly.
Now he fears that Britain is in line for similar punishment, because the country broke ranks with the European institution and it has angered bosses like EU’s Chief Brexit negotiator Michel Barnier.
Mr McCoy told The Telegraph: “Breaking ranks is a cardinal sin in the EU.
“I think Britain is in line for similar punishment to what I got when you hear the rumblings from Michel Barnier.
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“I hope to God I am wrong and that Brexit becomes a success for both sides.”
Following Theresa May’s landmark Brexit speech in Florence, Italy, yesterday, Mr Barnier said in a tweet that her speech was “constructive” but that it “must be translated into negotiating positions to make meaningful progress.”
He also stressed that the EU’s relationship with the UK must have less perks than membership.
Mrs May used her speech to press home that failing to reach a Brexit deal with the European Union would be a “damaging blow” to Europe’s future.
She urged EU leaders to approach the talks with creativity and ambition as she set out her ideas on breaking the deadlock in Brexit negotiations.
The talks, which will restart on Monday, have hit a roadblock on issues such as the amount that Britain must pay to settle its financial commitments to the bloc.
The EU is rumoured to want Britain to cough up 100 billion euros while Britain thinks the sum should be around 20 billion euros.
Mr Barnier has struck a negative tone throughout Brexit talks.
Yesterday, he noted that “for the first time, the United Kingdom government has requested to continue to benefit from access to the single market, on current terms.”
He said that if the leaders of the 27 other EU nations agree, then “this new request could be taken into account by the EU but is limited for a period of up to two years.”
Mr Barnier – had made it clear he was not prepared to open negotiations on a free trade deal until the issue is settled – but said he would be listening “attentively and constructively” to what she had to say.
He said earlier: “All that is necessary in this negotiation is that everyone honours the commitments that they have made to each other. To settle the accounts. No more, no less.”
Mr McCoy, alleges that he found widespread fraud in his former department – the Committee of the Regions, the EU’s regional and local representatives, in 2000.
But when he flagged it up, he was met with a wall of silence.
Mr Mccoy, was demoted in 2007 and had a pay slash.
The dad-of-four, who has lived in Brussels since 1973, has chosen to battle his ex employers as he believes that he has been treated unfairly.
He told The Telegraph: “The EU is a sacred cow that can’t be criticised.”
Regarding Mr McCoy’s case, the Committee of the Regions said it would not comment as it is still pending.
He told EU judges in Luxembourg that he was harassed.
An EU spokesman told the Telegraph: “It is our practice not to comment on ongoing disciplinary, investigation or litigation cases.
“Nonetheless we wish to reiterate our full commitment to closing the file as soon as possible.”
A spokeswoman for the EU told Express.co.uk: “We don’t comment on comments.”