This study explores the professional identity of Content and Language Integrated Learning (CLIL) teachers in Finnish primary education. It aims at explaining how CLIL teachers negotiate their pedagogical and relational identity, and how identity agency is exercised in negotiating a more encompassing professional identity. Thematic analysis of thirteen interviews outlines the bi-directional process of identity negotiation between personal and professional resources, and social contexts at work. The results highlight a connection between professional identity and agency, and suggest that identity negotiation is a process of working and sharing with others, but also individually.