diff --git a/litellm/router.py b/litellm/router.py
index c79dc2de09..d7535a83ae 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -2610,8 +2610,17 @@ class Router:
 
             if "azure" in model_name:
                 if api_base is None or not isinstance(api_base, str):
+                    filtered_litellm_params = {
+                        k: v
+                        for k, v in model["litellm_params"].items()
+                        if k != "api_key"
+                    }
+                    _filtered_model = {
+                        "model_name": model["model_name"],
+                        "litellm_params": filtered_litellm_params,
+                    }
                     raise ValueError(
-                        f"api_base is required for Azure OpenAI. Set it on your config. Model - {model}"
+                        f"api_base is required for Azure OpenAI. Set it on your config. Model - {_filtered_model}"
                     )
                 azure_ad_token = litellm_params.get("azure_ad_token")
                 if azure_ad_token is not None:
diff --git a/litellm/tests/test_router.py b/litellm/tests/test_router.py
index ed35321132..d76dec25c7 100644
--- a/litellm/tests/test_router.py
+++ b/litellm/tests/test_router.py
@@ -19,6 +19,25 @@ import os, httpx
 load_dotenv()
 
 
+def test_router_sensitive_keys():
+    try:
+        router = Router(
+            model_list=[
+                {
+                    "model_name": "gpt-3.5-turbo",  # openai model name
+                    "litellm_params": {  # params for litellm completion/embedding call
+                        "model": "azure/chatgpt-v-2",
+                        "api_key": "special-key",
+                    },
+                    "model_info": {"id": 12345},
+                },
+            ],
+        )
+    except Exception as e:
+        print(f"error msg - {str(e)}")
+        assert "special-key" not in str(e)
+
+
 @pytest.mark.parametrize("num_retries", [None, 2])
 @pytest.mark.parametrize("max_retries", [None, 4])
 def test_router_num_retries_init(num_retries, max_retries):