diff --git a/litellm/integrations/custom_logger.py b/litellm/integrations/custom_logger.py
index bf089c3646..98b0da25c5 100644
--- a/litellm/integrations/custom_logger.py
+++ b/litellm/integrations/custom_logger.py
@@ -58,6 +58,13 @@ class CustomLogger:  # https://docs.litellm.ai/docs/observability/custom_callbac
     def pre_call_check(self, deployment: dict) -> Optional[dict]:
         pass
 
+    #### Fallback Events - router/proxy only ####
+    async def log_success_fallback_event(self, original_model_group: str, kwargs: dict):
+        pass
+
+    async def log_failure_fallback_event(self, original_model_group: str, kwargs: dict):
+        pass
+
     #### ADAPTERS #### Allow calling 100+ LLMs in custom format - https://github.com/BerriAI/litellm/pulls
 
     def translate_completion_input_params(