diff --git a/ecs_files_composer/aws_mgmt.py b/ecs_files_composer/aws_mgmt.py
index d737790..5868fd1 100644
--- a/ecs_files_composer/aws_mgmt.py
+++ b/ecs_files_composer/aws_mgmt.py
@@ -38,7 +38,9 @@ class AwsResourceHandler(object):
     Class to handle all AWS related credentials init.
     """
 
-    def __init__(self, role_arn=None, external_id=None, region=None, iam_config_object=None):
+    def __init__(
+        self, role_arn=None, external_id=None, region=None, iam_config_object=None, client_session_override=None
+    ):
         """
         :param str role_arn:
         :param str external_id:
@@ -47,7 +49,9 @@ def __init__(self, role_arn=None, external_id=None, region=None, iam_config_obje
         """
         self.session = session.Session()
         self.client_session = session.Session()
-        if role_arn or iam_config_object:
+        if client_session_override:
+            self.client_session = client_session_override
+        elif not client_session_override and (role_arn or iam_config_object):
             if role_arn and not iam_config_object:
                 params = {"RoleArn": role_arn, "RoleSessionName": "EcsConfigComposer@AwsResourceHandlerInit"}
                 if external_id:
@@ -70,8 +74,10 @@ class S3Fetcher(AwsResourceHandler):
     Class to handle S3 actions
     """
 
-    def __init__(self, role_arn=None, external_id=None, region=None, iam_config_object=None):
-        super().__init__(role_arn, external_id, region, iam_config_object)
+    def __init__(
+        self, role_arn=None, external_id=None, region=None, iam_config_object=None, client_session_override=None
+    ):
+        super().__init__(role_arn, external_id, region, iam_config_object, client_session_override)
         self.client = self.client_session.client("s3")
 
     def get_content(self, s3_uri=None, s3_bucket=None, s3_key=None):
@@ -103,8 +109,10 @@ class SsmFetcher(AwsResourceHandler):
 
     arn_re = re.compile(r"(?:^arn:aws(?:-[a-z]+)?:ssm:[\S]+:[0-9]+:parameter)(?P<name>/[\S]+)$")
 
-    def __init__(self, role_arn=None, external_id=None, region=None, iam_config_object=None):
-        super().__init__(role_arn, external_id, region, iam_config_object)
+    def __init__(
+        self, role_arn=None, external_id=None, region=None, iam_config_object=None, client_session_override=None
+    ):
+        super().__init__(role_arn, external_id, region, iam_config_object, client_session_override)
         self.client = self.client_session.client("ssm")
 
     def get_content(self, parameter_name):
@@ -131,8 +139,10 @@ class SecretFetcher(AwsResourceHandler):
     Class to handle Secret Manager actions
     """
 
-    def __init__(self, role_arn=None, external_id=None, region=None, iam_config_object=None):
-        super().__init__(role_arn, external_id, region, iam_config_object)
+    def __init__(
+        self, role_arn=None, external_id=None, region=None, iam_config_object=None, client_session_override=None
+    ):
+        super().__init__(role_arn, external_id, region, iam_config_object, client_session_override)
         self.client = self.client_session.client("secretsmanager")
 
     def get_content(self, secret):