Sewing said the bank had done nothing wrong and was cooperating with prosecutors.

Asked in an interview with Die Zeit on the sidelines of the World Economic Forum in Davos about a possible tie-up with domestic rival Commerzbank, Sewing said: "I have a real task ahead of me, (to) bring back profit to Deutsche Bank.

"That's my main task, anything else is beyond what I am thinking about."

(Reporting by Jessica DiNapoli; writing by Silvia Aloisi; Editing by Mark Trevelyan)