Purpose Pandemics pose challenges to all groups of people and all aspects of human lives. Undocumented migrants are likely to face more challenges during global pandemics. The purpose of this paper is to explore the possible challenges of undocumented immigrants in Canada and the USA in the ongoing COVID-19 pandemic. Design/methodology/approach From existing literature, the authors examined the challenges of undocumented migrants in Canada and the USA and suggested recommendations to address those challenges at both policy and national levels. Findings The undocumented status of some international immigrants makes them vulnerable in their host nations. They face myriad challenges in their host countries, spanning from economic, health, social isolation and employment challenges, and these are further exacerbated during pandemics such as the ongoing COVID-19. The provision of culturally sensitive and safe policies may support this particular population, especially in times of crisis like the COVID-19 pandemic. Originality/value This paper provides critical insights into the possible intersections that worsen the vulnerability of undocumented migrants in pandemic crises like COVID-19. Further, this review serves to initiate the discourse on policy and interventions for undocumented immigrants during pandemics or disease outbreaks.