diff --git a/tempest/api/identity/v2/test_ec2_credentials.py b/tempest/api/identity/v2/test_ec2_credentials.py
index 8600980..5902196 100644
--- a/tempest/api/identity/v2/test_ec2_credentials.py
+++ b/tempest/api/identity/v2/test_ec2_credentials.py
@@ -36,16 +36,16 @@
     def test_create_ec2_credentials(self):
         """Create user ec2 credentials."""
         resp = self.non_admin_users_client.create_user_ec2_credentials(
-            self.creds.credentials.user_id,
-            tenant_id=self.creds.credentials.tenant_id)["credential"]
+            self.creds.user_id,
+            tenant_id=self.creds.tenant_id)["credential"]
         access = resp['access']
         self.addCleanup(
             self.non_admin_users_client.delete_user_ec2_credentials,
-            self.creds.credentials.user_id, access)
+            self.creds.user_id, access)
         self.assertNotEmpty(resp['access'])
         self.assertNotEmpty(resp['secret'])
-        self.assertEqual(self.creds.credentials.user_id, resp['user_id'])
-        self.assertEqual(self.creds.credentials.tenant_id, resp['tenant_id'])
+        self.assertEqual(self.creds.user_id, resp['user_id'])
+        self.assertEqual(self.creds.tenant_id, resp['tenant_id'])
 
     @test.idempotent_id('9e2ea42f-0a4f-468c-a768-51859ce492e0')
     def test_list_ec2_credentials(self):
@@ -54,24 +54,24 @@
         fetched_creds = []
         # create first ec2 credentials
         creds1 = self.non_admin_users_client.create_user_ec2_credentials(
-            self.creds.credentials.user_id,
-            tenant_id=self.creds.credentials.tenant_id)["credential"]
+            self.creds.user_id,
+            tenant_id=self.creds.tenant_id)["credential"]
         created_creds.append(creds1['access'])
         # create second ec2 credentials
         creds2 = self.non_admin_users_client.create_user_ec2_credentials(
-            self.creds.credentials.user_id,
-            tenant_id=self.creds.credentials.tenant_id)["credential"]
+            self.creds.user_id,
+            tenant_id=self.creds.tenant_id)["credential"]
         created_creds.append(creds2['access'])
         # add credentials to be cleaned up
         self.addCleanup(
             self.non_admin_users_client.delete_user_ec2_credentials,
-            self.creds.credentials.user_id, creds1['access'])
+            self.creds.user_id, creds1['access'])
         self.addCleanup(
             self.non_admin_users_client.delete_user_ec2_credentials,
-            self.creds.credentials.user_id, creds2['access'])
+            self.creds.user_id, creds2['access'])
         # get the list of user ec2 credentials
         resp = self.non_admin_users_client.list_user_ec2_credentials(
-            self.creds.credentials.user_id)["credentials"]
+            self.creds.user_id)["credentials"]
         fetched_creds = [cred['access'] for cred in resp]
         # created credentials should be in a fetched list
         missing = [cred for cred in created_creds
@@ -84,14 +84,14 @@
     def test_show_ec2_credentials(self):
         """Get the definite user ec2 credentials."""
         resp = self.non_admin_users_client.create_user_ec2_credentials(
-            self.creds.credentials.user_id,
-            tenant_id=self.creds.credentials.tenant_id)["credential"]
+            self.creds.user_id,
+            tenant_id=self.creds.tenant_id)["credential"]
         self.addCleanup(
             self.non_admin_users_client.delete_user_ec2_credentials,
-            self.creds.credentials.user_id, resp['access'])
+            self.creds.user_id, resp['access'])
 
         ec2_creds = self.non_admin_users_client.show_user_ec2_credentials(
-            self.creds.credentials.user_id, resp['access']
+            self.creds.user_id, resp['access']
         )["credential"]
         for key in ['access', 'secret', 'user_id', 'tenant_id']:
             self.assertEqual(ec2_creds[key], resp[key])
@@ -100,13 +100,13 @@
     def test_delete_ec2_credentials(self):
         """Delete user ec2 credentials."""
         resp = self.non_admin_users_client.create_user_ec2_credentials(
-            self.creds.credentials.user_id,
-            tenant_id=self.creds.credentials.tenant_id)["credential"]
+            self.creds.user_id,
+            tenant_id=self.creds.tenant_id)["credential"]
         access = resp['access']
         self.non_admin_users_client.delete_user_ec2_credentials(
-            self.creds.credentials.user_id, access)
+            self.creds.user_id, access)
         self.assertRaises(
             lib_exc.NotFound,
             self.non_admin_users_client.show_user_ec2_credentials,
-            self.creds.credentials.user_id,
+            self.creds.user_id,
             access)
diff --git a/tempest/api/identity/v2/test_tenants.py b/tempest/api/identity/v2/test_tenants.py
index b742e69..cc6de47 100644
--- a/tempest/api/identity/v2/test_tenants.py
+++ b/tempest/api/identity/v2/test_tenants.py
@@ -24,7 +24,7 @@
 
     @test.idempotent_id('ecae2459-243d-4ba1-ad02-65f15dc82b78')
     def test_list_tenants_returns_only_authorized_tenants(self):
-        alt_tenant_name = self.alt_manager.credentials.credentials.tenant_name
+        alt_tenant_name = self.alt_manager.credentials.tenant_name
         resp = self.non_admin_tenants_client.list_tenants()
 
         # check that user can see only that tenants that he presents in so user
diff --git a/tempest/api/identity/v2/test_tokens.py b/tempest/api/identity/v2/test_tokens.py
index 3b508f4..bdca1e0 100644
--- a/tempest/api/identity/v2/test_tokens.py
+++ b/tempest/api/identity/v2/test_tokens.py
@@ -43,8 +43,8 @@
         self.assertGreater(expires_at, now)
 
         self.assertEqual(body['token']['tenant']['id'],
-                         creds.credentials.tenant_id)
+                         creds.tenant_id)
         self.assertEqual(body['token']['tenant']['name'],
                          tenant_name)
 
-        self.assertEqual(body['user']['id'], creds.credentials.user_id)
+        self.assertEqual(body['user']['id'], creds.user_id)
diff --git a/tempest/api/identity/v2/test_users.py b/tempest/api/identity/v2/test_users.py
index 79f2576..4833f9e 100644
--- a/tempest/api/identity/v2/test_users.py
+++ b/tempest/api/identity/v2/test_users.py
@@ -46,9 +46,9 @@
             client.auth_provider.clear_auth()
             client.auth_provider.set_auth()
 
-        old_pass = self.creds.credentials.password
+        old_pass = self.creds.password
         new_pass = data_utils.rand_password()
-        user_id = self.creds.credentials.user_id
+        user_id = self.creds.user_id
         # to change password back. important for allow_tenant_isolation = false
         self.addCleanup(_restore_password, self.non_admin_users_client,
                         user_id, old_pass=old_pass, new_pass=new_pass)
diff --git a/tempest/api/identity/v3/test_projects.py b/tempest/api/identity/v3/test_projects.py
index 1574ab7..26cb90b 100644
--- a/tempest/api/identity/v3/test_projects.py
+++ b/tempest/api/identity/v3/test_projects.py
@@ -25,7 +25,7 @@
     @test.idempotent_id('86128d46-e170-4644-866a-cc487f699e1d')
     def test_list_projects_returns_only_authorized_projects(self):
         alt_project_name =\
-            self.alt_manager.credentials.credentials.project_name
+            self.alt_manager.credentials.project_name
         resp = self.non_admin_users_client.list_user_projects(
             self.os.credentials.user_id)
 
diff --git a/tempest/api/identity/v3/test_users.py b/tempest/api/identity/v3/test_users.py
index 76b46c0..c92e750 100644
--- a/tempest/api/identity/v3/test_users.py
+++ b/tempest/api/identity/v3/test_users.py
@@ -46,9 +46,9 @@
             client.auth_provider.clear_auth()
             client.auth_provider.set_auth()
 
-        old_pass = self.creds.credentials.password
+        old_pass = self.creds.password
         new_pass = data_utils.rand_password()
-        user_id = self.creds.credentials.user_id
+        user_id = self.creds.user_id
         # to change password back. important for allow_tenant_isolation = false
         self.addCleanup(_restore_password, self.non_admin_users_client,
                         user_id, old_pass=old_pass, new_pass=new_pass)
diff --git a/tempest/cmd/verify_tempest_config.py b/tempest/cmd/verify_tempest_config.py
index 72ea894..f558740 100644
--- a/tempest/cmd/verify_tempest_config.py
+++ b/tempest/cmd/verify_tempest_config.py
@@ -384,7 +384,7 @@
     icreds = credentials.get_credentials_provider(
         'verify_tempest_config', network_resources=net_resources)
     try:
-        os = clients.Manager(icreds.get_primary_creds())
+        os = clients.Manager(icreds.get_primary_creds().credentials)
         services = check_service_availability(os, update)
         results = {}
         for service in ['nova', 'cinder', 'neutron', 'swift']:
diff --git a/tempest/manager.py b/tempest/manager.py
index cafa5b9..72762ab 100644
--- a/tempest/manager.py
+++ b/tempest/manager.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.common import cred_provider
 from tempest import config
 from tempest import exceptions
 from tempest.lib import auth
@@ -34,7 +33,7 @@
         Credentials to be used within the various client classes managed by the
         Manager object must be defined.
 
-        :param credentials: type Credentials or TestResources
+        :param credentials: An instance of `auth.Credentials`
         :param scope: default scope for tokens produced by the auth provider
         """
         self.credentials = credentials
@@ -42,15 +41,9 @@
         if not self.credentials.is_valid():
             raise exceptions.InvalidCredentials()
         self.auth_version = CONF.identity.auth_version
-        # Tenant isolation creates TestResources, but
-        # PreProvisionedCredentialProvider and some tests create Credentials
-        if isinstance(credentials, cred_provider.TestResources):
-            creds = self.credentials.credentials
-        else:
-            creds = self.credentials
         # Creates an auth provider for the credentials
-        self.auth_provider = get_auth_provider(creds, pre_auth=True,
-                                               scope=scope)
+        self.auth_provider = get_auth_provider(
+            self.credentials, pre_auth=True, scope=scope)
 
 
 def get_auth_provider_class(credentials):
diff --git a/tempest/scenario/utils.py b/tempest/scenario/utils.py
index 75fd000..c7ba659 100644
--- a/tempest/scenario/utils.py
+++ b/tempest/scenario/utils.py
@@ -107,7 +107,8 @@
             name='InputScenarioUtils',
             identity_version=CONF.identity.auth_version,
             network_resources=network_resources)
-        os = clients.Manager(self.cred_provider.get_primary_creds())
+        os = clients.Manager(
+            self.cred_provider.get_primary_creds().credentials)
         self.compute_images_client = os.compute_images_client
         self.flavors_client = os.flavors_client
         self.image_pattern = CONF.input_scenario.image_regex
diff --git a/tempest/test.py b/tempest/test.py
index d31c509..4c0d0bb 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -541,7 +541,8 @@
             else:
                 raise exceptions.InvalidCredentials(
                     "Invalid credentials type %s" % credential_type)
-        return cls.client_manager(credentials=creds, service=cls._service)
+        return cls.client_manager(credentials=creds.credentials,
+                                  service=cls._service)
 
     @classmethod
     def clear_credentials(cls):
@@ -640,7 +641,7 @@
                 credentials.is_admin_available(
                     identity_version=cls.get_identity_version())):
             admin_creds = cred_provider.get_admin_creds()
-            admin_manager = clients.Manager(admin_creds)
+            admin_manager = clients.Manager(admin_creds.credentials)
             networks_client = admin_manager.compute_networks_client
         return fixed_network.get_tenant_network(
             cred_provider, networks_client, CONF.compute.fixed_network_name)
diff --git a/tempest/tests/test_base_test.py b/tempest/tests/test_base_test.py
index dc355b4..01b8a72 100644
--- a/tempest/tests/test_base_test.py
+++ b/tempest/tests/test_base_test.py
@@ -66,7 +66,7 @@
         test.BaseTestCase.get_tenant_network()
 
         mock_man.assert_called_once_with(
-            mock_prov.get_admin_creds.return_value)
+            mock_prov.get_admin_creds.return_value.credentials)
         mock_iaa.assert_called_once_with(
             identity_version=mock_giv.return_value)
         mock_gcp.assert_called_once_with()