The 24th edition of the CIES Football Observatory Monthly Report studies the demographic evolution of the big-5 European leagues since the 2009/10 season. The analysis focuses on the percentages of domestic league minutes played by four categories of players: club-trained, under 21s, expatriates and recent arrivals.

The studies carried out since 2005 by the CIES Football Observatory are not only geared towards the general public, but are also useful to actors in the game. The 23rd Monthly Report illustrates an approach that allows a professional football league to analyse on an objective basis its international positioning and influence in a positive way the strategic choices of the clubs that compose it. The example chosen is that of the Swiss Football League.

Goalkeepers occupy a particular status in football teams. The qualities needed to play in this position are very different from those required from outfield footballers. Issue number 22 of the CIES Football Observatory Monthly Report compares goalkeeper characteristics with those of footballers playing in other positions. More particularly, the study examines the criteria of height, age, origin and mobility.

The 21st Monthly Report of the CIES Football Observatory presents a predictive analysis of the number of points that each big-5 league club will obtain at the end of the season. In order to do this, we use a multivariate statistical model built on the basis of results observed from the 2011/12 season onwards. The model takes into account the offensive and defensive performances of big-5 league teams until the 31st December of each season, as well as the level of their grip on the game.

Issue number 20 of the CIES Football Observatory Monthly Report investigates the international mobility of minors in football. It notably reveals that the number footballers who left their country before to turn 18 playing in 31 top division leagues of UEFA member associations has reached a new record high in 2016. English clubs are by far the most active in the international recruitment of minors.

The 19th Monthly Report presents the main findings of the annual census carried out since 2009 by the CIES Football Observatory on the profile of players active in 31 top division leagues of UEFA member associations. The study shows that the presence of club-trained players continues to decrease, while that of expatriates is on the increase. The greater international mobility of players brings with it a growing instability in squads.