Deutsche Bank is examining the potential impact on its business of a U.K. exit from the European Union (EU), the German bank said on Tuesday.
A spokesperson for the bank confirmed to CNBC that it has set up a working group to look at the issue although, "it is at an early stage, with no decisions made."
The newly re-elected British Prime Minister, David Cameron, has promised a referendum on the U.K.'s EU membership by the end of 2017 at the latest.
"The working group will do scenario-based planning on implications on our presence in the U.K., including whether it would be advantageous for certain activities to be repatriated to the euro zone, specifically to Germany," the Deutsche Bank spokesperson said in an email.
An unexpected win for the ruling Conservative Party in a general election less than two weeks ago has raised uncertainty about U.K. membership of the EU, hurting the outlook for the British pound.
HSBC, Britain's biggest bank, warned in April about the economic risks the U.K. faced if it withdrew from the EU, as it revealed that it was looking into moving its headquarters from the country.
Anatole Kaletsky, co-founder and chief economist at Gavekal Dragonomics, told CNBC on Monday that Britain leaving the EU was a "big risk" because the country is more "dependent on capital inflows than any other major economy in the world."
Since the May 7 election, many businesses have urged the government to call the referendum sooner rather than later in order to end the uncertainty that could hit confidence and the economy.
Bank of England Governor, Mark Carney, added his voice to the debate last week, saying it was "in the interests of everybody" to resolve the issue of the U.K.'s EU membership.
As one of the world's biggest financial centres, any changes to how major banks operate in the U.K.'s capital city could have far-reaching consequences.
Deutsche Bank, the euro zone's second-largest bank in terms of assets, has just under 9,000 employees in the U.K. Its presence in the country dates back to 1873.
Robert Noel, CEO of Land Securities, a commercial property firm that has its headquarters in central London, said he did not believe that businesses would leave the city if the U.K. leaves the EU– an event referred to as "Brexit."
"London is the global financial centre. No one can challenge it," Noel told CNBC Europe's "Squawk Box" on Tuesday, in answer to a question about whether he was worried about London losing its status.
"We don't like the uncertainty of potentially coming out of the EU, and as soon as that uncertainty is cleared up, we can get on with our lives. These people are not going to leave our shores in droves," he added.