ALSO READHaving fastest-growing EU economy isn't making this country's people richer Europe's return to crisis? Deutsche Bank to shift only a few hundred London jobs due to Brexit Catalonia, Spain and the economic consequences of a split November was best month for euro zone factories since April 2000: PMI data
The new guidelines, which will kick in next year, set out "principles" such as the need for banks to run "stress tests" to quantify their robustness in different circumstances.
Although the proposed guidelines are non-binding, the ECB can threaten banks with higher capital requirements if they fail to comply.
"Supervisory experience shows that banks may need to improve they quality of their internal capital and liquidity adequacy assessment processes," the ECB said.
The ECB said the new guidelines aim at smoothing out differences among the roughly 120 large euro zone banks it supervises.
"Banks are expected to assess the risks they face, and in a forward-looking manner ensure that all material risks are identified, effectively managed and covered by adequate capital and liquidity levels at all times," it added.
The ECB will now seek industry feedback on the proposed new rules via a public consultation due to run until May 4.