The debate regarding the economic effects of employing immigrants has attracted renewed interest in European countries since the economic crisis. We provide an approximation of the labour market effects of immigrant workers in four European countries during the global economic crisis after briefly analysing native and foreign-born worker conditions for the most recent period. Our analysis focuses on the correlation between the stock of immigrant workers and the number of native labour market workers across several segments of the labour market using a simple model approach. Using Eurostat and LFS (Labour Force Survey) data, we estimate a structural dynamic model using the generalised method of moments (GMM) to examine adjustment dynamics in the labour market and labour market segment and worker educational levels, countries of origin and genders. Overall, the empirical results suggest that immigrant labour force effects on native-born worker employment rates have been persistent and but weak throughout the business cycle. These effects are globally positive, and immigrant origins do not appear to change the nature of their impact. We offer some explanations for these findings related to dual labour markets and to differences in levels of substitution among native and immigrant workers.