The CIES Football Observatory just published its 38th Monthly Report. The study analyses club strategies in the area of player turnover for the five major European leagues since 2005/06. It reveals that too many changes in line-ups do not constitute a good strategy for optimising results. On the contrary, high turnover levels tend to affect players’ confidence and aggravate the situation.
Seventeen of the twenty teams whose 11 most fielded footballers played for the least percentage of minutes relegated. This is a clear reflection of the real danger faced by clubs of finding themselves trapped in a vicious circle of poor results and instability, and vice versa. The existence of a negative correlation between turnover and points per match confirms the relevance of sticking with a core group of footballers to optimise performance.
The only team in the period studied that fielded less than 20 players over a season was Borussia Mönchengladbach in 2014/15. This did not prevent them from finishing in an excellent third place. That season, the team coached by Lucien Favre also participated in the Europa League, where it reached the last 16. While the achievement of good results reduces the incentives for player turnover, the Report shows that low player turnover in turn favours good results.