"I am optimistic about the environment globally for financial institutions,'' Josef Ackermann said in a statement, without offering details.
He said he believed the global economic system, supported by regulators and central banks, would contain the U.S. subprime-loan crisis, which Germany's largest bank described last month as creating "very challenging" market conditions as the crisis spread.
"The turbulent market conditions during the month of August inevitably affected Deutsche Bank, notably in sales and trading and corporate finance," Ackermann said.
But "thanks to Deutsche Bank's strong risk management, our counterparty and credit exposures remained well controlled," he said.
Notable deaths of 2014 [PHOTOS]
GM recalls 221,000 Cadillacs and Impalas