To advance the understanding about primary school teachers' allocation process of pupils during the transition to secondary education, this study aims to investigate the influencing teacher expectations of teacher track recommendations. Using a qualitative research design consisting of an inductive approach, interview data were gathered from 15 Flemish sixth-grade teachers. The results indicate that foremost teacher expectations of pupils, more specifically of pupils' perceived motivation or interests and learning attitude, were considered by teachers as influencing their track recommendations. Although empirical evidence was also found for the impact of expectations held by teachers about pupils' parents and about themselves as teachers, as well as about teaching, teachers' awareness of the impact of one's own expectations was limited.