diff --git a/inference-engine/tests/functional/shared_test_classes/include/shared_test_classes/base/ov_subgraph.hpp b/inference-engine/tests/functional/shared_test_classes/include/shared_test_classes/base/ov_subgraph.hpp
index a0b73d7b092..b662584158d 100644
--- a/inference-engine/tests/functional/shared_test_classes/include/shared_test_classes/base/ov_subgraph.hpp
+++ b/inference-engine/tests/functional/shared_test_classes/include/shared_test_classes/base/ov_subgraph.hpp
@@ -63,9 +63,8 @@ protected:
 
     LayerTestsUtils::Summary& summary = LayerTestsUtils::Summary::getInstance();
 
-private:
-    std::vector<ov::runtime::Tensor> calculate_refs();
-    std::vector<ov::runtime::Tensor> get_plugin_outputs();
+    virtual std::vector<ov::runtime::Tensor> calculate_refs();
+    virtual std::vector<ov::runtime::Tensor> get_plugin_outputs();
 };
 
 inline std::vector<std::vector<InputShape>> static_shapes_to_test_representation(const std::vector<std::vector<ov::Shape>>& shapes) {