The closure of schools across the globe due to the COVID-19 pandemic had the potential to have a catastrophic impact on a fundamental pillar of initial teacher education: school placement. This paper maps a new "site" of professional practice for "school placement" called "Teacher Online Programme" (TOP) using Xu and Brown's (2016) conceptual framework of teacher assessment literacy in practice. Its main focus lies in the integration of the assessment baseline knowledge into the programme under the seven elements proposed by the framework. A case study methodology informed the approach taken. Data was collected and analysed in three phases: the Teaching Online Programme Year 3 (TOP3) initiative; Student-teacher and Tutor Questionnaires and Student-teacher and Tutor focus group interviews. The findings highlight the complex and multifaceted process of building teacher assessment identity which nests in the larger purposes for education. They encourage an emergentist and collaborative approach to assessment knowledge and view working in communities of practice as a threshold for creativity and innovation.