Within the expansive domain of mega-projects, a focal area of significant relevance is the management of major sporting events. Investigating sports events within the context of mega-projects not only holds intrinsic interest but also carries substantial importance for the advancement of mega-project management and accounting literature. This unique perspective introduces a fresh dimension to the existing literature, diverging from the traditional ex-post emphasis on legacy assessments within mega-projects. Thus, our discussion paper attempts to combine the evaluations of sustainability disclosure and legacy evaluation in the debate on mega-sport event. This proposition is underpinned by two primary driving forces in the ongoing scholarly discourse: the progressive orientation towards sustainability principles, as well as the mutual call from various scholars for cross-fertilization and integration of the study focus areas. In light of this rationale, and following an examination of existing legacy evaluation models conducive to informing discussions on the integration of sustainability dimensions, we have adopted the framework proposed by Preuss (2007) due to its widespread adoption and dissemination within the literature, as well as its inherent focus on longitudinally measuring legacy. Consequently, this study follows and structures the dissertation according to Preuss’s (2007) work and framework, discussing the different elements of legacy: infrastructure, knowledge, image, emotions, networks, culture. Accordingly, a discussion is provided for each of the themes and dimensions involved. For each of the elements is contextually provided a preliminary discussion of both the aspects of legacy involved, in relation to the aspects of sustainability disclosure in sport mega-events. In conclusion, our research agenda advocates for a comprehensive and interconnected approach in shaping future studies, aligning with the concept of ‘cross-fertilisation’ outlined in the recent ‘Manifesto for project management research’ proposed by Locatelli et al. (2023). Furthermore, our proposal suggests the adoption of broadly accepted criteria for assessing the socio-economic and environmental impacts of such interventions.