| Summary: | The policy of using foreign players and their impact on club success is still relevant and can be viewed from multiple angles. This article focuses on the impact of the proportion of foreign players’ appearances on the success of football clubs in their home leagues, as well as in European competitions. The research is focused on the most successful European clubs over the last ten years. A total of 19 European clubs were selected for research purposes, which resulted in 190 cases. Statistical tests, correlation, and regression analysis were used for their verification. The research shows that there is a dependence between the appearances by foreign players in matches and the success of clubs in domestic and European competitions. Furthermore, the trend of higher use of foreign players compared to domestic players was also proved. The presented research provides a different perspective on the issue, attributing greater importance to the appearances by players in matches compared to other studies, considering only the total number of foreign players.
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