The largest banks in the UK are facing a $2.5bn shortfall because of the country’s financial system, according to the UK Financial Services Authority.
The UK FSA said it was considering taking action against Barclays, Royal Bank of Scotland and Lloyds Banking Group over the shortfall.
Barclays, Lloyards and RBS all say they have taken steps to address the shortfall, while Royal Bank and Llobds said they would review their strategies.
The government has been pushing banks to fix their financial systems after a string of scandals and the failure of a major banking unit to meet financial regulator standards.
In the run-up to the vote, the Treasury also announced it was to spend £30bn on banks to try to shore up the financial system.