The business environment is currently faced with dynamic changes caused by globalization pressures, market liberalization and other trends. Additional pressures, recently came from pandemic (COVID-19), but also the Russian-Ukrainian conflict. However, beside numerous challenges, those pressures brought new opportunities for companies. Businesses generally opt for internationalization as a key strategy for success and a better competitive position. Successfulness of that process depends on many factors, however, deep understanding of the foreign market presents the most important. In this thesis, the process of internationalization is analyzed based on a case study and an interview conducted with the top management of AD Plastik, a leading company in the automotive industry in Republic of Croatia. The subject of this paper and the objectives are to determine the strategic role of top management in this process and to elaborate in detail the factors that influenced on international market enlargement decision. The paper therefore presents the results of interviews with the top management of AD Plastik. From the above, various data were obtained on the role of top management in internationalization, on a concrete example, as well as on challenges and obstacles. During the internationalization and expansion of business, AD Plastik approaches carefully, monitoring the market situation and adjusts its own business and processes accordingly.