The German bank - which has its UK headquarters in Canary Wharf - is believed to be looking at its options should Britain leave the EU.

However, a spokesman for the bank told the BBC that it is “early days and no decisions have been made”.

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It was announced earlier this month that Deutsche Bank made an offer to sub-let 350,000sq ft at 10 Upper Bank Street, where it has a sub lease from Clifford Chance until 2028.

The bank - which employs 9,000 people in the UK - is the first to announce it is formally examining the potential fallout from the referendum, according to the Financial Times.

Many businesses have urged the Government to bring forward the referendum.