International guidance set forth recommendations to protect marginalized migrant populations during Covid-19 given the significant inequalities in terms of social and economic well-being reported in the literature. However, a cross-country study of three European countries with high rates of Covid-19 infections and deaths has shown that migrant well-being has significantly decreased since the outbreak of Covid-19 in Europe from March 2020 and that policy measures to help those marginalized populations have been insufficient. The conclusions on migrant well-being during Covid-19 draw on interviews with prominent civil society organizations in all three countries that work specifically on migrant health and welfare. All interviews were semi-structured and conducted between October and November 2020. The analysis mainly focuses on objective/material measures of well-being related to access to health care, information on prevention of infection, housing and exclusion by host population.