English for Academic Purposes (EAP) teacher identity formation has garnered increasing scholarly attention in recent years. However, the conception of identity in most of the existing studies is a rather limited one from a critical sociolinguistic perspective. These investigations predominantly focus on how EAP teachers construct their institutional identities while navigating the transition from teaching General to Academic English. Addressing the need for broader and more critical conceptualizations of EAP teacher identity, in the current study, we aimed to explore how EAP teachers construct their professional identities in relation to ideologies embedded in a transnational Sino-British English medium university context in China. A narrative survey completed by 77 EAP teachers and interviews with 36 of them were used as sources of qualitative data, and thematic analysis was used as the data analysis procedure. The findings shed light on how these teachers’ identities are shaped in response to the dominant values and language ideologies within this transnational context. Specifically, neoliberal ideologies seem to mold EAP into a standardized and homogeneous educational service, and many EAP teachers find it challenging to resist the homogeneity but to accept to being (1) “a cog in a machine.” Additionally, the institutional policies appear to prioritize English-only practices grounded in monolingual ideology, leading many EAP teachers to adopt an identity of (2) ‘a (fake) monolingual role model’ when interacting with their students. Furthermore, a prevailing assumption equating internationalization with Westernization seems to have made these EAP teachers develop an identity as (3) ‘British acculturation agents,’ responsible for disseminating knowledge from universities in core countries to those at the periphery. We discuss how this study contributes insights into EAP language teacher identity from a critical perspective, highlighting power dynamics surrounding English and English language education within the EAP domain.