Based on a respondent driven sampling survey with 500 Polish migrant workers in Denmark, this article argues that specific labour market institutions and sector differences need to be taken into account when explaining the working conditions of migrant workers. Comparing the working conditions of Polish and Danish workers, it is shown that labour market institutional arrangements provide a better explanation for the differences found between the two groups than differences in individual characteristics of the migrants and the Danish workforce. In addition, the article argues that factors such as institutionalized wage variability within sectors and the decentralized regulation of working conditions are important when assessing the potential implication of migrant workers in the labour market.