Anton Börner, president of the German federation of trade and services (BGA), claimed instead markets only remain calm because investors are entirely disregarding the departure.
He said: “Brexit is just talk so far. I doubt it will ever happen. The markets are not expecting Brexit either. Otherwise you would see the stock market crash through the floor or British interest rates would be exploding.
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“British financial markets are ticking along relatively well because investors assume that Brexit is just political chatter rather than reality.”
Whatever form Brexit takes, Mr Börner believes it will be “strongly cushioned in order not to overwhelm the economy”.
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But he also suggested the Brexit debate could have wide-reaching consequences for the Brussels bloc, whether Britain leaves or not.
He told Die Welt: “The EU will become more an economic union and the plans for a stronger political unity will be dropped.
“With some states, Germany will become increasingly politically intertwined, with France, for example, or the Benelux countries.
“But with other countries there will only be economic connections. Look at Eastern Europe.
“Hungary and Poland will not be able to agree on common political positions with Germany in the foreseeable future. We must accept this reality.”
Mr Börner, 62, led the BGA for 16 years but will hand the office to his successor Holger Bingmann two days after the Bundestag election this weekend.
His comments today offer a rare glimpse into attitudes in Berlin, where many still believe the UK will back down on its Brexit demands and remain in the Brussels-based union.
While last night a senior German party figure declared the UK should not rely on Angela Merkel to ease Brexit deadlock if she forms a government with the Free Democratic Part (FDP).
The FDP candidate Michael Theurer warned against raised expectations from the UK despite having publicly called for a more pragmatic approach to the negotiations.