diff --git a/litellm/proxy/_experimental/mcp_server/sampling_handler.py b/litellm/proxy/_experimental/mcp_server/sampling_handler.py
index 814cdad7e22..71da0e605ae 100644
--- a/litellm/proxy/_experimental/mcp_server/sampling_handler.py
+++ b/litellm/proxy/_experimental/mcp_server/sampling_handler.py
@@ -476,6 +476,8 @@ async def handle_sampling_create_message(
 
             from litellm.proxy.litellm_pre_call_utils import add_litellm_data_to_request
             from litellm.proxy.proxy_server import proxy_config
+            
+            completion_kwargs["user"] = getattr(user_api_key_auth, "user_id", None)
 
             # We need a dummy FastAPI request object because add_litellm_data_to_request expects it
             _dummy_request = Request(