diff --git a/cosmos/operators/_asynchronous/bigquery.py b/cosmos/operators/_asynchronous/bigquery.py
index e6a604e5f6..a7e3909868 100644
--- a/cosmos/operators/_asynchronous/bigquery.py
+++ b/cosmos/operators/_asynchronous/bigquery.py
@@ -33,9 +33,12 @@
 from cosmos.constants import AIRFLOW_VERSION
 from cosmos.dataset import get_dataset_alias_name
 from cosmos.exceptions import CosmosValueError
+from cosmos.log import get_logger
 from cosmos.operators.local import AbstractDbtLocalBase
 from cosmos.settings import remote_target_path, remote_target_path_conn_id
 
+logger = get_logger(__name__)
+
 DEFAULT_PRODUCER_ASYNC_TASK_ID = "dbt_setup_async"
 
 
@@ -117,6 +120,11 @@ def __init__(
         # BigQueryInsertJobOperator parameters and hence fails to initialise the operator due to missing arguments.
         # To fix this, we temporarily set the base class to only BigQueryInsertJobOperator during initialization,
         # then restore the full inheritance chain afterward.
+        if kwargs.pop("deferrable", True) is False:
+            logger.warning(
+                "DbtRunAirflowAsyncBigqueryOperator requires deferrable=True. "
+                "The provided value of False has been ignored."
+            )
         DbtRunAirflowAsyncBigqueryOperator.__bases__ = (BigQueryInsertJobOperator,)
         super().__init__(
             gcp_conn_id=self.gcp_conn_id,
diff --git a/tests/operators/_asynchronous/test_bigquery.py b/tests/operators/_asynchronous/test_bigquery.py
index 700f17f0fb..2ede7dead2 100644
--- a/tests/operators/_asynchronous/test_bigquery.py
+++ b/tests/operators/_asynchronous/test_bigquery.py
@@ -45,6 +45,33 @@ def test_dbt_run_airflow_async_bigquery_operator_init(profile_config_mock):
     assert operator.full_refresh is False  # Default value should be False
 
 
+def test_dbt_run_airflow_async_bigquery_operator_init_with_deferrable_false_warns(profile_config_mock, caplog):
+    """Passing deferrable=False must not raise TypeError, be overridden to True, and log a warning."""
+    import logging
+
+    with caplog.at_level(logging.WARNING, logger="cosmos.operators._asynchronous.bigquery"):
+        operator = DbtRunAirflowAsyncBigqueryOperator(
+            task_id="test_task",
+            project_dir="/path/to/project",
+            profile_config=profile_config_mock,
+            dbt_kwargs={"task_id": "test_task"},
+            deferrable=False,
+        )
+    assert operator.deferrable is True
+    assert "deferrable=True" in caplog.text
+
+
+def test_dbt_run_airflow_async_bigquery_operator_init_deferrable_defaults_true(profile_config_mock):
+    """deferrable defaults to True when not supplied."""
+    operator = DbtRunAirflowAsyncBigqueryOperator(
+        task_id="test_task",
+        project_dir="/path/to/project",
+        profile_config=profile_config_mock,
+        dbt_kwargs={"task_id": "test_task"},
+    )
+    assert operator.deferrable is True
+
+
 def test_dbt_run_airflow_async_bigquery_operator_base_cmd(profile_config_mock):
     """Test base_cmd property returns the correct dbt command."""
     operator = DbtRunAirflowAsyncBigqueryOperator(