The article aims to analyse the national parliaments’ capability of exerting influence on the European Commission in the framework of the yellow card procedure. The analysis is based on the actions undertaken by national parliaments of selected Member States from Western as well as Central and Eastern Europe within the period between the announcement of the European Commission proposal for a targeted revision of Directive 96/71/EC on the posting of workers and its decision to maintain the proposal. The analysis covers three variables concerning the states selected for analysis, namely the economic interest of those states, the coherence of their parliaments’ respective positions and the actions undertaken by the national parliaments, including those of their members, on the international level.