Irregular migration, as a consequence of the refugee and migration crisis, is the biggest problem that has emerged in the EU since World War II. The area of irregular entry is certainly one of the most important problem, precisely because of the legal gaps of the Dublin III Regulation. Problems arising from irregular migrations came before the Court of Justice of the European Union in two cases, whose outcomes have consequences for the Republic of Croatia. The passage of third-country nationals from the Republic of Croatia for humanitarian reasons has resulted in irregular migration because requirements for entry into the state territory were not met. The CJEU has discussed issues relating to the presumption of lawful entry into the territory of the European Union and the issue of the treatment of a Member State in which a third-country national has first entered. The importance of the CJEU decision is in the fact that it clarifies that the mechanism established by the Dublin III Regulation must inevitably apply, even in exceptional circumstances. Such a court ruling changed the direction of CEAS and maintained the strength of the Dublin system. The issue decided by the court laid down new definitions of illegal migration and the framework for Member States to act. That is why these judgments are of great importance for the issue of illegal migration, as well as for the Republic of Croatia.