In the Nordic context, transnational discourses influence recontextualisation of ideas and discourses, and thus, how local actors negotiate around values imbued with ideas and discourses. In Sweden, the idea of teacher assistants has been prompted -- through policy discourses on teacher professionalism -- under imperatives of reducing teachers' workload and increasing professional responsibility and accountability. The aim of this article is to explore teacher assistants' values regarding roles and responsibilities in relation to teachers and education in light of policy discourses on teacher professionalism. Drawing on discursive institutionalism and curriculum theory, the concept of 'discursive space' is utilized to explore values in an institutional context. Based on twelve interviews with teacher assistants in compulsory schools, the analysis shows how a reductionist notion of teaching gives rise to dilemmas around being teachers' 'alter ego' when values around teaching as 'core' are prioritized. Dilemmas around local pluralization emerge when teacher assistants are viewed as a 'solution' to a plethora of issues. Challenges emerge in the context of ambiguity around teacher assistants' orientation towards teaching or processes 'surrounding' teaching. The analysis illustrates conditioned values highlighting dilemmas and challenges, but also possibilities for discursive action. Altogether, a re-negotiation of teacher professionalism emerges in the discursive space.