diff --git a/litellm/router_utils/prompt_caching_cache.py b/litellm/router_utils/prompt_caching_cache.py
index c1ecec048e4..4ec0bc62e7f 100644
--- a/litellm/router_utils/prompt_caching_cache.py
+++ b/litellm/router_utils/prompt_caching_cache.py
@@ -179,10 +179,16 @@ def _lookback_keys(positions: tuple[PrefixPosition, ...]) -> tuple[str, ...]:
     return tuple(entry.cache_key for entry in reversed(positions) if entry.position > oldest_probed_position)
 
 
+def _carrier_cache_control(carrier: Mapping[str, JsonValue]) -> JsonValue | None:
+    function: Final = carrier.get("function")
+    nested: Final = function.get("cache_control") if isinstance(function, dict) else None
+    return carrier.get("cache_control", nested)
+
+
 def _breakpoint_pin_ttl_seconds(carrier: JsonValue | Mapping[str, JsonValue]) -> int | None:
     if not isinstance(carrier, Mapping):
         return None
-    cache_control: Final = carrier.get("cache_control")
+    cache_control: Final = _carrier_cache_control(carrier)
     if not isinstance(cache_control, dict) or cache_control.get("type") != "ephemeral":
         return None
     return PROMPT_CACHE_ONE_HOUR_PIN_TTL_SECONDS if cache_control.get("ttl") == "1h" else PROMPT_CACHE_PIN_TTL_SECONDS
diff --git a/tests/unit/router_utils/test_prompt_caching_cache.py b/tests/unit/router_utils/test_prompt_caching_cache.py
index 7c8ad04c0fb..46af2454dea 100644
--- a/tests/unit/router_utils/test_prompt_caching_cache.py
+++ b/tests/unit/router_utils/test_prompt_caching_cache.py
@@ -65,6 +65,11 @@ def _tool(cache_control: dict[str, str] | None) -> ChatCompletionToolParam:
     return {**tool, "cache_control": cache_control} if cache_control else tool
 
 
+def _function_marked_tool(cache_control: dict[str, str]) -> ChatCompletionToolParam:
+    tool: Final = _tool(None)
+    return {**tool, "function": {**tool["function"], "cache_control": cache_control}}
+
+
 @pytest.mark.parametrize(
     ("messages", "tools", "expected_ttl"),
     [
@@ -108,6 +113,12 @@ def _tool(cache_control: dict[str, str] | None) -> ChatCompletionToolParam:
             PROMPT_CACHE_ONE_HOUR_PIN_TTL_SECONDS,
             id="1h-on-tools-only",
         ),
+        pytest.param(
+            _system_block_messages({"type": "ephemeral"}),
+            [_function_marked_tool({"type": "ephemeral", "ttl": "1h"})],
+            PROMPT_CACHE_ONE_HOUR_PIN_TTL_SECONDS,
+            id="1h-nested-under-function",
+        ),
         pytest.param(
             _system_block_messages({"type": "ephemeral"}),
             [_tool(None)],