Growing interest in student research projects in higher education has led to an emphasis on research supervision. We focus in this study on novice supervisors' approaches to research supervision as they explore their practices and experience difficulties supervising medical-students. Teacher noticing was used as a sensitising concept and relations with teacher dilemmas were explored in the research supervision context. To provide in-depth insights into supervisors' practices and pedagogical choices, twelve stimulated recall interviews with supervisors were analysed. The supervisors were involved in individual undergraduate or master degree student research projects at a research-intensive university. Analysis revealed four kinds of dilemmas which may influence research supervision practices, namely questions regarding regulation, student needs, the student-supervisor relationship and supervisors' professional identity. We explain the relationship between novice supervisors' practices and dilemmas in detail. Implications are given to enhance initiatives for professional development of supervisors.