The aim of this study is to analyze the sportive and financial performance of 50 major football clubs in 10 European countries that give directions to the European football and to investigate the reasons affecting the club performances. The clubs' efficiency is investigated in two stages. In the first stage, technical efficiency scores of the clubs were calculated by means of data envelopment analysis for the seasons of 2007/2008 - 2017/2018. In the second stage, the reasons behind the efficiency differences were investigated by using random effect panel Tobit model. According to the findings, while winning rates of clubs and increase in number of players in the youth system and more competitive national league affect the team performance positively, participation in the European cups and coach changes during the season affect the team performance negatively.