This study on English as means of instruction (EMI) implementation possible barriers affirms the statement that teacher cognition needs to be studied in context since there are considerable differences in how EMI is implemented and experienced by teachers, even though the aspect of internationalisation is highlighted on the top level of university management. The results may be acknowledged to be in line with the previous studies as EMI is considered a complex phenomenon encompassing student proficiency in the language of instruction, change in teaching and learning environments and methodologies, as well as teacher attitudes towards EMI. Students, on the other hand, highlight as the most important factor in the fluent communication in a particular discipline and a clear and precise content transference.