Co-chief executive at Deutsche Bank Anshu Jain is concerned that proposed global regulations could strangle Europe's financial sector.
He thinks the continent's universal banking system - which combines retail and investment banking - is under threat and this would be taking things "too far".
The industry has undergone many changes since the bottom fell out of the global economy in 2008-09, with a raft of new legislative measures being introduced as it became clear that businesses and lenders required much tighter regulation.
While this has stabilised things, Mr Jain is worried that new laws are somewhat over-zealous and could inadvertently stifle financial companies.
"If all the measures before us were implemented as proposed, they would practically spell the end of over 100 years of universal banking in Europe," he commented during a speech at Frankfurt University's Centre for Financial Studies.
Deutsche Bank is one of many lenders across Europe that combines retail and investment banking and the number of banks that could be forced to alter their operations if these proposed laws are brought in is huge.
By Tony Aynsley