Instead Stephen Jones, head of the newly formed mega lobby UK Finance, said Britain's financial district should instead prepare for any fallout if it loses its passporting rights.
According to the City of London’s top financial consortium, a cliff-edge Brexit come 2019 would most likely pose serious dangers to Europe’s entire financial system, but will be avoided at all costs by the EU and Theresa May's Government.
Stephen Jones, head of the newly formed mega lobby UK Finance, told The Daily Telegraph: “A hard rupture from day one would be very disruptive on a Continental scale.
"The European banking system does not have the infrastructure capable of absorbing these activities.”
Referencing Germany’s all-powerful finance minister, Mr Jones said: “Everybody realises this and I cannot believe that either the UK or the EU would let it happen. Wolfgang Schauble’s cabinet totally understands it.”
Senior City figures have pushed for an early agreement on a longer transition period, ensuring a smoother way forward for the UK’s enormous financial services sector, stopping banks, asset managers and insurers from making hurried decisions.
However, Brussels has pushed back on the idea, with EU negotiator Michael Barnier claiming that such an arrangement would only be discussed once a “clearer picture” of the UK’s broader post-Brexit relationship with the EU has taken shape.
Passporting rights allow financial services registered in the UK to operate in the European Economic Area.
Firms are granted passporting rights in return for complying with single market rules.
At present, London handles the lion’s share of European issued debt and equity securities, alongside much of the continent’s syndicated lending and risk management.
Each day, around 40 per cent of the £3.84 trillion ($5 trillion) of global currency trades are booked in London, alongside two thirds of all interest rate Euro derivatives, chiefly on behalf of European firms.
Mr Jones said: “Our working assumption is that EU regulators will be flexible from day one, but over time they will require more infrastructure to move.”
The former Santander and Barclays finance director, took control of the UK Finance consortium, formed last month by the merger of the British Bankers’ Association, the Asset Based Finance Association, the Council of Mortgage Lenders, and three other entities.
He reminded financial spectators it is not yet clear if the EU will demand all syndicated-loans, capital markets and interest rate derivatives based in euros be moved to Europe, or how much "local content" the be demanded.
Mr Jones said: “We just don’t know. We would like mutual recognition where we accept each other’s supervisory regime. If there is the political will, this might be possible. We hear different things.”