diff --git a/litellm/main.py b/litellm/main.py
index fb0f649345d..d47b625f6b3 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -1182,6 +1182,21 @@ def completion(  # type: ignore # noqa: PLR0915
         tools=tools,
         sanitize_openai_function_tool_names=_sanitize_openai_fn_tool_names,
     )
+    if (
+        _sanitize_openai_fn_tool_names
+        and isinstance(tool_choice, dict)
+        and tool_choice.get("type") == "function"
+    ):
+        _fn = tool_choice.get("function")
+        if isinstance(_fn, dict) and isinstance(_fn.get("name"), str):
+            from litellm.utils import _sanitize_openai_function_tool_name as _san_name
+
+            _sanitized_tc_name = _san_name(_fn["name"], -1)
+            if _sanitized_tc_name != _fn["name"]:
+                tool_choice = {
+                    **tool_choice,
+                    "function": {**_fn, "name": _sanitized_tc_name},
+                }
     # validate tool_choice
     tool_choice = validate_chat_completion_tool_choice(tool_choice=tool_choice)
     # validate optional params
diff --git a/tests/test_litellm/test_utils.py b/tests/test_litellm/test_utils.py
index c917bbde1b7..bfbc216e2da 100644
--- a/tests/test_litellm/test_utils.py
+++ b/tests/test_litellm/test_utils.py
@@ -4112,3 +4112,32 @@ def test_convert_to_model_response_restores_openai_tool_call_names_when_mapped()
     )
     assert out.choices[0].message.tool_calls is not None
     assert out.choices[0].message.tool_calls[0].function.name == "plugin.subtool"
+
+
+def test_tool_choice_function_name_sanitized_with_tools():
+    from litellm.litellm_core_utils.openai_tool_name_mapping import (
+        begin_openai_tool_name_mapping_scope,
+    )
+    from litellm.utils import _sanitize_openai_function_tool_name, validate_and_fix_openai_tools
+
+    begin_openai_tool_name_mapping_scope()
+    validate_and_fix_openai_tools(
+        tools=[
+            {
+                "type": "function",
+                "function": {
+                    "name": "my.tool",
+                    "parameters": {"type": "object", "properties": {}},
+                },
+            }
+        ],
+        sanitize_openai_function_tool_names=True,
+    )
+    # Simulate what main.py does for tool_choice
+    tool_choice = {"type": "function", "function": {"name": "my.tool"}}
+    _fn = tool_choice["function"]
+    sanitized = _sanitize_openai_function_tool_name(_fn["name"], -1)
+    if sanitized != _fn["name"]:
+        tool_choice = {**tool_choice, "function": {**_fn, "name": sanitized}}
+
+    assert tool_choice["function"]["name"] == "my_tool"