Eastern and Central European labour migration following the EU enlargement has significant impact on the Nordic labour markets. This article demonstrates, through sector-based case studies in Denmark, how labour migration influences working condition and wages in two sectors that have so far only been sparsely studied: the agriculture and cleaning industries. The high inflow of labour migrants is used by some employers to bypass and undermine the institutionalized class compromise, by employing EU8/2-workers at lower wages and often without collective agreements coverage frequently combined with below average working conditions. This put strains on the Danish agreement-based model of industrial relations, potentially leading to a more segmented labour market as well as replacement of native, mainly low-skilled workers with EU8/2-workers.