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The ECB has made Deutsche the first bank under its supervision to report on the cost and consequences of its investment bank's exit from the global markets.

Deutsche is currently reviewing the role of its investment bank - known internally as Project Colombo - to determine the way forward as revenues shrink and clients look for profit elsewhere.

Regulators are known to scrutinise large, struggling institutions like €1.1 trillion Deutsche Bank over their potential to plumge the global financial system into meltdown as see with the collapse of Lehman Brothers in 2008.

Lehman's sudden and shocking fall intensified the 2008 crisis and wiped $10 trillion from global markets.

Although a Deutsche Bank source confirmed to the Financial Times that other Eurozone banks would also be tested, the ECB’s scrutiny comes amid speculation as to the future of Deutsche’s UK-based investment bank.