Leading footballers are increasingly investing in clubs. According to an analysis by Globo Esporte, Lionel Messi acquired all shares in UE Cornellà in April. The Catalan club compete in Spain's fifth tier and are known for their academy.

Messi has also reached an agreement in principle to acquire Eldense. That transaction still requires final legal and contractual steps, as well as approval from Spain's Sports Council.

Cristiano Ronaldo invested in Almería through CR7 Sports Investments in February. The Portugal forward acquired a 25 per cent stake in the Spanish second-division club.

Football finance specialist Moises Assayag points to the lower entry costs and growth potential at smaller clubs. A famous player's name and international following can also create new commercial opportunities.