Internship is one of the most important elements of any professional course. This is where the student implements the theoretical knowledge in actual situations. School internship has been an integral part of teacher education programmes from the inception itself. Student teachers get the opportunity to apply the techniques, methods, approaches and theories in actual classroom situation during school internship. This phase of the teacher education programme is also considered as the make or break phase for the student teachers. National Council for Teacher Education (NCTE) revised the course structure of B Ed and M Ed programmes in India in the year 2014. As a result, the course duration of B Ed programme was extended to two years. School internship period for the B Ed students also was extended to 20 weeks which previously ranged from six to seven weeks. NCTE also provided detailed guidelines for the school internship of B Ed students in the year 2016. Roles and responsibilities of each and every partner in the teacher education programme were clearly delineated. Two important players in the school internship programme for the student teacher are the mentor teacher in the school and the supervising teacher in the institute of teacher education. The paper attempts to explain what are the important roles assigned to the mentor teachers and the supervising teachers by the NCTE and how and to what extend these roles are played by them. Data has been collected from the teacher educators who act as faculty supervisors during school internship of B Ed students of various institutions of teacher education under Kannur Univeristy of Kerala state. [This paper was published in "Edutracks" v18 n9 p26-33 May 2019.]