diff --git a/tests/components/lg_netcast/test_device_trigger.py b/tests/components/lg_netcast/test_device_trigger.py
index b5c970aff07..22ba0352bbf 100644
--- a/tests/components/lg_netcast/test_device_trigger.py
+++ b/tests/components/lg_netcast/test_device_trigger.py
@@ -1,4 +1,7 @@
-"""The tests for LG NEtcast device triggers."""
+"""The tests for LG Netcast device triggers."""
+
+from collections.abc import Generator
+from unittest.mock import patch
 
 import pytest
 
@@ -19,6 +22,13 @@ from . import ENTITY_ID, UNIQUE_ID, setup_lgnetcast
 from tests.common import MockConfigEntry, async_get_device_automations
 
 
+@pytest.fixture(autouse=True)
+def mock_lg_netcast() -> Generator[None]:
+    """Mock LG Netcast library."""
+    with patch("homeassistant.components.lg_netcast.LgNetCastClient"):
+        yield
+
+
 async def test_get_triggers(
     hass: HomeAssistant, device_registry: dr.DeviceRegistry
 ) -> None:
diff --git a/tests/components/lg_netcast/test_trigger.py b/tests/components/lg_netcast/test_trigger.py
index d838b931560..da62c57c912 100644
--- a/tests/components/lg_netcast/test_trigger.py
+++ b/tests/components/lg_netcast/test_trigger.py
@@ -1,5 +1,6 @@
 """The tests for LG Netcast device triggers."""
 
+from collections.abc import Generator
 from unittest.mock import patch
 
 import pytest
@@ -17,6 +18,13 @@ from . import ENTITY_ID, UNIQUE_ID, setup_lgnetcast
 from tests.common import MockEntity, MockEntityPlatform
 
 
+@pytest.fixture(autouse=True)
+def mock_lg_netcast() -> Generator[None]:
+    """Mock LG Netcast library."""
+    with patch("homeassistant.components.lg_netcast.LgNetCastClient"):
+        yield
+
+
 async def test_lg_netcast_turn_on_trigger_device_id(
     hass: HomeAssistant,
     service_calls: list[ServiceCall],