The Federal Reserve has privately advised major banks not to mount aggressive opposition to proposed new capital requirements, according to sources familiar with the matter.

The guidance comes as the central bank continues to develop stricter capital rules for large financial institutions, part of ongoing regulatory reforms aimed at strengthening the banking system's resilience.

The Fed's message to banks represents an attempt to manage industry response to the regulatory changes, which are expected to require institutions to hold additional capital buffers against potential losses.

Banking industry representatives have historically pushed back on stricter capital requirements, arguing they could limit lending capacity and economic growth. The Fed's guidance suggests officials want to avoid a protracted public battle over the new rules.

The capital rule discussions are part of broader regulatory efforts following lessons learned from recent banking sector stress and global financial stability concerns. Implementation timelines and specific requirements for the new rules have not been finalized.