diff --git a/vllm/entrypoints/openai/engine/protocol.py b/vllm/entrypoints/openai/engine/protocol.py
index f4e5fe733..ced89691f 100644
--- a/vllm/entrypoints/openai/engine/protocol.py
+++ b/vllm/entrypoints/openai/engine/protocol.py
@@ -49,7 +49,7 @@ class OpenAIBaseModel(BaseModel):
 
         # Compare against both field names and aliases
         if any(k not in field_names for k in data):
-            logger.warning(
+            logger.debug(
                 "The following fields were present in the request but ignored: %s",
                 data.keys() - field_names,
             )