Telecollaboration, or "online intercultural exchange" (OIE), refers to the application of online communication tools to bring together classes of language learners in geographically distant locations with the aim to develop their foreign language skills and intercultural competence through collaborative tasks and project work. Many studies have demonstrated the potential of this activity for supporting collaborative learning and developing intercultural awareness. This article focuses on the implications for teachers and addresses the question: what are the skills, attitudes and knowledge which a foreign language teacher needs to establish and successfully carry out an online intercultural exchange with their learners? To answer this question, the paper presents research based on the Delphi technique, consulting a large group of "experts" and "experienced practitioners" and achieving a gradual consensus on the necessary telecollaborative skills, knowledge and attitudes. The final set of competences is presented and problematic issues related to the model are discussed with reflections on the comments from the experts who participated in the study.