diff --git a/nutanix/ncp/plugins/module_utils/entity.py b/nutanix/ncp/plugins/module_utils/entity.py
index f907b1e99..8ee8ae72d 100644
--- a/nutanix/ncp/plugins/module_utils/entity.py
+++ b/nutanix/ncp/plugins/module_utils/entity.py
@@ -215,8 +215,12 @@ def clean_spec(self, spec):
         for key, value in spec.copy().items():
             if isinstance(value, str):
                 if value.startswith('{{') and value.endswith('}}'):
-                    value = getattr(self, value[2:-2], None)
+                    value = value[2:-2]
+
+                    value = getattr(self, value, None)
                     if value:
+                        if key == 'guest_customization':
+                            value = self.get_attr_spec(key, value)
                         spec[key] = value
                     else:
                         spec.pop(key)
diff --git a/nutanix/ncp/plugins/module_utils/prism/vms.py b/nutanix/ncp/plugins/module_utils/prism/vms.py
index 7c01bbb34..0b327451d 100644
--- a/nutanix/ncp/plugins/module_utils/prism/vms.py
+++ b/nutanix/ncp/plugins/module_utils/prism/vms.py
@@ -3,7 +3,7 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 from copy import deepcopy
-
+from base64 import b64encode
 from .prism import Prism
 
 
@@ -15,7 +15,8 @@ class VM(Prism):
     def get_attr_spec(self, param, param_spec, **kwargs):
         param_method_spec = {
             "disk_list": VMDisk,
-            "nic_list": VMNetwork
+            "nic_list": VMNetwork,
+            "guest_customization": GuestCustomizationSpec
         }
 
         if param in param_method_spec:
@@ -207,7 +208,6 @@ def __get_subnet_ref(self, name, **kwargs):
 
     def _get_api_spec(self, param_spec, **kwargs):
 
-        _di_map = {}
         final_nic_list = []
         for nic_param in param_spec:
             nic_final = self.get_default_spec()
@@ -224,8 +224,7 @@ def _get_api_spec(self, param_spec, **kwargs):
                         "uuid": v
                     }
                 elif k == "subnet_name" and not nic_param.get("subnet_uuid"):
-                    nic_final["subnet_reference"] = self.__get_subnet_ref(
-                        v, **kwargs)
+                    nic_final["subnet_reference"] = self.__get_subnet_ref(v, **kwargs)
 
                 elif k == "ip_endpoint_list" and bool(v):
                     nic_final[k] = [{"ip": v[0]}]
@@ -237,3 +236,45 @@ def _get_api_spec(self, param_spec, **kwargs):
 
     def __call__(self, param_spec, **kwargs):
         return self._get_api_spec(param_spec, **kwargs)
+
+
+class GuestCustomizationSpec(VMSpec):
+
+    @staticmethod
+    def get_default_spec():
+        return deepcopy(
+            {
+                "sysprep": {
+                    "install_type": "",
+                    "unattend_xml": "",
+                    "custom_key_values": {},
+                },
+                "cloud_init": {
+                    "meta_data": "",
+                    "user_data": "",
+                    "custom_key_values": {},
+                },
+                "is_overridable": ""
+                }
+        )
+
+    def _get_api_spec(self, param_spec, **kwargs):
+
+        gc_spec = self.get_default_spec()
+        script_file_path = param_spec["script_path"]
+        with open(script_file_path, "r") as f:
+            content = f.read()
+        content = b64encode(content)
+        type = param_spec["type"]
+        if type == "sysprep":
+            gc_spec[type]["unattend_xml"] = content
+        elif type == "cloud_init":
+            gc_spec[type]["user_data"] = content
+        gc_spec["is_overridable"] = param_spec.get("is_overridable")
+
+        self.remove_null_references(gc_spec)
+
+        return gc_spec
+
+    def __call__(self, param_spec, **kwargs):
+        return self._get_api_spec(param_spec, **kwargs)
diff --git a/nutanix/ncp/plugins/modules/nutanix_vms.py b/nutanix/ncp/plugins/modules/nutanix_vms.py
index 51af7ce69..663e84d5f 100755
--- a/nutanix/ncp/plugins/modules/nutanix_vms.py
+++ b/nutanix/ncp/plugins/modules/nutanix_vms.py
@@ -110,7 +110,12 @@ def run_module():
                                               'memory_size_mib', 'memory_gb']),
         metadata__categories_mapping=dict(type='dict', aliases=['categories']),
         metadata__use_categories_mapping=dict(
-            type='bool', aliases=['use_categories_mapping'], default=False)
+            type='bool', aliases=['use_categories_mapping'], default=False),
+        spec__resources__guest_customization=dict(type='dict', aliases=['guest_customization'], options=dict(
+            type=dict(type="str", choices=["sysprep", "cloud_init"], default="sysprep"),
+            script_path=dict(type="str", required=True),
+            is_overridable=dict(type="bool", default=False)
+        ))
     ))
 
     module = BaseModule()