In 2014 it asked Citigroup to pay $12 billion over mortgage-backed securities and then settled at $7 billion.
Other US banks which have reached settlements over the matter are JPMorgan Chase ($13 billion), Bank of America ($16.6 billion) and Goldman Sachs ($5 billion).
Cryan has insisted that Deutsche would not try to raise extra capital through a rights issue until it knows how much historic legal issues will cost it. But investors fear that a fund-raising is becoming more urgent.
European banks this week complained to regulators about the speed of new Basel reforms forcing them to boost their capital buffers.