This paper is focused on the implementation of the founding values of the European Union (Article 2 of the Treaty on European Union) in the national constitutional law of the EU candidate countries. The last enlargement packages obliged candidate countries to pay attention to credible reforms on the fundamentals. The previous model of EU enlargement was mainly based on the full acceptance of the acquis, but the adoption of EU legislation in various areas did not guarantee that “European” values are fully accepted and respected in the candidate countries. The new clusters in the new methodology “Fundamentals” means protecting common values which requires their implementation in the national constitutional law. Thus, this paper analyses the state of Europeanisation of national constitutional law in comparative perspective.