EXPLAINER: How soccer’s eligibility rules work and their impact on the World Cup

ATLANTA — Morocco’s strong start against Brazil on the opening weekend of the FIFA World Cup and Cape Verde’s surprise draw against Spain highlighted a growing global trend in international football: the increasing reliance on diaspora talent developed across Europe.

Morocco’s starting lineup against Brazil was a striking example of this shift. All 11 starters were born outside the country and trained within European club systems, reflecting years of strategic recruitment and development of players with Moroccan heritage abroad. The only exception in terms of development pathway was goalkeeper Yassine Bounou, who, despite being born in Canada, progressed through Moroccan football structures.

Similarly, Cape Verde, a nation of roughly 600,000 people, has built a competitive international squad by tapping into its diaspora communities. Many of its players were born or raised in Europe, enabling the team to reach a level of performance that would have been difficult to achieve domestically alone. Just two decades ago, Cape Verde had not even entered World Cup qualifying competitions, underscoring the rapid transformation of its football program.

Across Africa, and increasingly in other regions, national teams have strengthened their competitiveness by recruiting players from migrant communities in Europe. This trend has been accelerated by global migration patterns, expanded scouting networks, and evolving eligibility rules established by FIFA.

Eligibility rules shaping modern squads

All players at the World Cup must hold citizenship for the country they represent, verified through passport checks. To prevent the misuse of naturalization purely for sporting advantage, FIFA requires players to meet eligibility criteria, such as having lived in the country for at least five years or having a parent or grandparent born there.

In the early years of international football, eligibility rules were far less restrictive. Notably, Luis Monti played for Argentina in the 1930 World Cup before representing Italy four years later after moving to Juventus. This lack of regulation eventually led FIFA to enforce stricter rules, tying players permanently to a national team once they had appeared in an official competition.

Policy evolution and player movement

The modern system began to change in the early 2000s, largely due to lobbying from North African football federations. Officials argued that players of African origin, often developed in European youth systems, were being locked out of senior international football after representing European junior teams.

“We didn’t think it was fair that players of African origin were being selected for junior teams of European countries and then never getting a chance to play at full international level,” said Mohamed Raouraoua, former president of the Algerian Football Federation. “Our proposal was to give liberty and freedom to these players to have a right to choose.”

In response, FIFA amended its statutes in 2003, allowing players to switch national teams if they held dual nationality and had not yet played at the senior competitive level. An initial age restriction of 21 was later removed, broadening eligibility and significantly increasing player mobility at the international level.

Early adopters and notable switches

One of the first players to benefit from the revised rules was Antar Yahia, who had previously represented France at youth level. He later made his senior debut for Algeria in 2004 after switching allegiance, marking a turning point in how national eligibility was interpreted in international football.

Since then, numerous high-profile players have followed similar paths. Pierre-Emerick Aubameyang and Frédéric Kanouté, both former French youth internationals, went on to become stars for African national teams and were later named African Footballer of the Year.

Senegal captain Kalidou Koulibaly also transitioned from France’s youth system to represent Senegal, where he has earned over 100 international caps and become a key defensive leader.

The trend is not limited to Africa. England midfielder Declan Rice, who previously represented Ireland at youth and senior friendly levels, switched allegiance to England and has since become a central figure in midfield at the international level.

Growing impact on global football

The influence of diaspora players is now a defining feature of modern international tournaments. This World Cup features 289 players — nearly a quarter of all participants — representing countries other than their birthplace. Many have qualified through ancestry or residency pathways established under FIFA rules.

The impact has been particularly visible in emerging football nations, where diaspora recruitment has rapidly elevated competitiveness. Senegal’s Ibrahim Mbaye, for example, scored against France just months after last representing them at youth level, illustrating how quickly players can transition between national systems under current regulations.

As international football continues to evolve, the combination of migration, dual nationality, and flexible eligibility rules is reshaping national team identities. Countries like Morocco and Cape Verde are no longer exceptions but part of a broader transformation in how global football talent is developed, selected, and represented on the world stage. -Writing by Mark Gleeson in Atlanta; Editing by Ed Osmond/Reuters