Real Sociedad is the second most sustainable club of the five major leagues in Europe after Manchester City. A study by CIES Football Observatory classifies the continent's teams according to their sustainable squad management index (SSM), which is calculated based on the combination of the youth of the squad, the average stay in the squad and the duration of the contract. The higher these factors, the higher the index for each club. The participation of each player is also taken into account considering the aforementioned factors.
La Real rub shoulders with European greats such as City (1st), Liverpool (3rd), Leipzig (4th) or United (5th), especially due to the short average age of its squad, 25.62 years, the youngest among the top 10 of this ranking along with that of the Germans (25.5).
In La Liga, Real leads the ranking related to the sustainable management of squads index, with that figure of 99.7. They are followed by Madrid (98.03) and Athletic (27.33)