A new manager—and new key players? Eintracht Frankfurt could face a major exodus of players this summer.

Disappointment for Eintracht Frankfurt's Hugo Larsson: the midfielder has been left out of the Swedish national-team squad.

Player development in football follows many different paths. Some exceptional talents, such as Lamine Yamal and Estevao, make an impact at the highest level at a very young age. At the same time, countless players need more time before their qualities fully emerge.

Eintracht Frankfurt have earned a sterling reputation for developing players from the promising bracket to top-class and selling them on for significant profit in recent years, particularly in attacking positions. The German club made around €208 million (£181m/$242m) by transferring Luka Jovic, Sebastien Haller and Randal Kolo Muani to AC Milan, West Ham and Paris Saint-Germain, respectively, and boosted that total by another €170m (£148/$198) last season when two more talismanic performers caught the eye of Europe's elite.