Although scholars working in core practices have put forth lesson rehearsals as central to novice teachers' learning and development, there is little work on how novice teachers experience rehearsals. This qualitative research investigated learning opportunities for novice teachers of language learners during rehearsals. The analysis examines two focal novice teachers from different second language methods instructional contexts--a methods course in a TESOL licensure program and a methods course in a world language licensure program--to explore the multiple ways in which novice teachers might experience rehearsals as learning opportunities in second language teacher preparation programs. Findings indicate that the focal novice teachers experienced rehearsal as an important opportunity for externalization of core practices, which is facilitated by dialogic mediation. Implications include the need for further research regarding the nature of interaction in rehearsal and how rehearsal influences novice teachers' subsequent enactment of practice.