Britain's National Crime Agency has said that it was aware of the use of UK-registered companies in connection with Danske Bank's Estonian branch which is at the centre of a money-laundering scandal.
The agency has opened an investigation.
Denmark's biggest lender also faces a new Danish investigation over a scandal involving €200 billion in payments, many of which the bank has said are suspicious.
Danske CEO Thomas Borgen resigned on September 19 after an investigation commissioned by Danske exposed control and compliance failings at the branch between 2007 and 2015.
An NCA spokeswoman said the threat posed by the use of UK company structures in money laundering was widely recognised and that the NCA was working with partners across government to restrict the ability of criminals to use these.