In football, training club compensation is mandatory : https://www.easportslaw.com/news/training-compensation-and-solidarity-mechanism https://www.easportslaw.

In football, training club compensation is mandatory : https://www.easportslaw.com/news/training-compensation-and-solidarity-mechanism https://www.easportslaw.com/news/training-compensation-and-s... Sure, this is a FIFA regulation (and not state or EU) but let's not act like this is purely voluntary.