Although research reveals that pre-service student teachers often regard their relationships with their significant others as an important element of their initial teaching practice experience, much remains unknown about the influence of significant others on non-native English as a Second Language (ESL) student teachers' professional learning process during field experiences. This paper presents the findings of a qualitative study of the professional learning experiences of 17 pre-service non-native ESL student teachers during an eight-week-long practicum. Grounded in a sociocultural view of teacher learning, the study explores how the ESL student teachers developed their understanding of professional learning in the light of their experiences of engaging with their supporting teachers, supervisors, other school staff members as well as peer student teachers during the practicum. Analysis of the data reveals that these people assumed the role of coach either directly or indirectly, having a positive influence on the student teachers' role as a teacher. Analysis of the data also reveals negative interactions between student teachers and their significant others, which sociocultural theories have so far not taken sufficiently into account. While, findings of this study challenge past assumptions about where knowledge for teaching comes from and how it can be learned; this study also suggests an urgent need to consolidate university-school partnership to foster student teachers' adaptation to the context of teaching practice and maximise their professional learning opportunities.