The legal position of refugees, stateless persons and asylum- seekers is a legal domain which falls under the dual field of regulation- the one regulated by public international law in the form of peremptory norms contained in international treaties and referred customary rules, while the other domain of regulation rests with the realm of national law provisions of a particular state. With Croatia's accession to the EU, European law becomes a part of its domestic legal system, and in this regard it is essential to ascertain- in the context of an analysis of the legal position of a category of persons provided by this study – from this particular stance especially the European Charter of Fundamental Rights ( which legal instrument has the same legal value and binding force as the Treaty on European Union as well as the Treaty on the Functioning of the European Union), as an example of a primary source of EU law, but also the general principles of EU law which are embodied in the judicial practice of the European Court of Justice in Luxembourg, as well as the EU regulations and directives in their role of the secondary sources of EU law- which legal instruments altogether form the basis and scope for national regulation in the referred domain depicted by International and Temporary Protection Act of 2015. Domestic regulations which determine the legal position and provide protection and fulfillment of rights of refugees, stateless persons and asylum- seekers predominatly fall within the context of Croatian administrative law provisions implementation, and on this very basis the study in question seeks to identify the designated scope of domestic law as an area which exemplifies the ongoing process of europeanisation and harmonisation between European law and national law. Nevertheless, the changes which have been triggered by the new political and legal reality in the form of Croatia's EU membership exceed the very frame of legislative regulation as such, and also cause - given the fact that international treaties in force between the EU and the third State parties, precisely as the secondary EU legislation ( here, a particular focus is to be placed both on EU regulations, which are directly applicable and bind in their entirety, and EU directives- which bind regarding the end result and goal of regulation, while but leave to the national authonomy the choice of form and methods ) as well, represent the legal sources which bind the national courts of the Member State in terms of their enforcement- significant repercussions for the national judiciary system. In this context, Croatia's International and Temporary Protection Act certainly should be validated as a renedering of the EU legislation if not - the embodyment itself of the acquis communautaire on the national level; yet, it remains to be seen whether this particular approach and legislative solution would be able to suit the future needs and match Croatian national interest in domain of those sovereign powers which have not been transferred to the supranational EU bodies. The case of massive immigration and refugee flow which spread accross Europe in 2015, which particular event was followed by and went hand in hand with both the partial suspension of the Dublin Regulation and jeopardizing the Schengen Agreement- might represent an indication that precisely those very same, administrative law derived, issues could set off the wider political and constitutional redefining motion on the overall plain of the European Union.