diff --git a/model-optimizer/mo/main.py b/model-optimizer/mo/main.py
index 3a9553a2bc0..f3998be279e 100644
--- a/model-optimizer/mo/main.py
+++ b/model-optimizer/mo/main.py
@@ -96,7 +96,7 @@ def print_argv(argv: argparse.Namespace, is_caffe: bool, is_tf: bool, is_mxnet:
     print('\n'.join(lines), flush=True)
 
 
-def prepare_ir(argv: argparse.Namespace):
+def get_moc_frontends(argv: argparse.Namespace):
     fem = argv.feManager
     available_moc_front_ends = []
     moc_front_end = None
@@ -117,6 +117,12 @@ def prepare_ir(argv: argparse.Namespace):
             elif argv.framework in available_moc_front_ends:
                 moc_front_end = fem.load_by_framework(argv.framework)
 
+    return moc_front_end, available_moc_front_ends
+
+
+def arguments_post_parsing(argv: argparse.Namespace):
+    moc_front_end, available_moc_front_ends = get_moc_frontends(argv)
+
     is_tf, is_caffe, is_mxnet, is_kaldi, is_onnx =\
         deduce_framework_by_namespace(argv) if not moc_front_end else [False, False, False, False, False]
 
@@ -279,8 +285,15 @@ def prepare_ir(argv: argparse.Namespace):
         from mo.front.onnx.register_custom_ops import get_front_classes
         import_extensions.load_dirs(argv.framework, extensions, get_front_classes)
 
+    return argv
+
+
+def prepare_ir(argv):
+    argv = arguments_post_parsing(argv)
+
     graph = None
     ngraph_function = None
+    moc_front_end, available_moc_front_ends = get_moc_frontends(argv)
 
     if argv.framework not in available_moc_front_ends:
         graph = unified_pipeline(argv)