The most frequent challenge stated as a barrier to the implementation of English Medium Instruction (EMI) is the lack of English proficiency among faculty members, who are typically not trained to linguistically structure their lectures before adopting EMI in a classroom context. Therefore, this study was aiming to determine the faculty members' perspectives on EMI, as well as the institutional policies regarding the plan for EMI implementation, and the type of training materials faculty members need the most. A mixed methods case study design was conducted at a private university on the Indonesian island of Sumatera using purposive sampling, with 67 faculty members from 11 departments responding to the questionnaire and 2 stakeholders being interviewed. The data was analyzed qualitatively yet employed quantitative calculations. The results indicated that (1) the majority of faculty members have positive attitudes toward EMI, (2) the stakeholders and the institution strongly support the implementation of EMI within the institution's policy, and (3) the language and communication use aspect is the most needed training material for EMI training. On the basis of this study's findings, it is strongly recommended that the EMI training for faculty members be conducted based on the needs of the faculty members for the success of EMI Program.