Diego Costa was able to play for Spain because FIFA eligibility rules allowed him to switch national teams after representing Brazil only in friendly matches.
The former Atletico Madrid striker was born in Brazil but later gained Spanish nationality after living in Spain. That made him eligible to represent Spain, provided he met FIFA’s rules on nationality and had not been tied permanently to Brazil in a competitive senior match.
His case remains one of the most famous examples of a player changing international allegiance before a major tournament.
How FIFA National Team Eligibility Works
FIFA’s basic rule is simple: a player must hold the nationality of the country they want to represent.
That nationality can come through birth, ancestry, residence or another lawful route recognised by the country involved.
FIFA’s own eligibility commentary explains that nationality may be acquired in several ways, including residence, marriage or a government decision.
Why Players Can Switch Countries
A footballer can be eligible for more than one national team.
This can happen when a player:
- Was born in one country but has parents or grandparents from another
- Gains citizenship through residence
- Has dual nationality
- Played only youth football or friendlies for one country
- Qualifies under special nationality rules
FIFA modernised its eligibility rules in 2020, partly to give more legal clarity around players changing associations.
Why Diego Costa Was Eligible for Spain
Costa played two friendlies for Brazil in 2013 against Italy and Russia.
Those matches did not permanently tie him to Brazil because they were not senior competitive fixtures.
After gaining Spanish citizenship in July 2013, Costa was eligible to switch to Spain because he had lived in the country long enough and had not played a competitive senior match for Brazil.
Had he played for Brazil in a World Cup qualifier, Copa America match or another binding senior competitive fixture, the switch would have been much harder under FIFA rules.
What Makes a Player Tied to One Country?
A player usually becomes tied to a national team after appearing in an official competitive match, depending on the player’s age, eligibility status and FIFA’s current switch rules.
Friendly matches do not normally bind a player permanently.
That is why Costa could play for Brazil in friendlies and later represent Spain at senior level.
Other Famous National Team Switches
Costa is not the only player to switch international allegiance.
Other examples include players who represented one country at youth level before choosing another at senior level.
Some players qualify through family ancestry, while others qualify through residence or dual nationality.
The issue often becomes controversial because fans see national teams as symbols of identity, loyalty and belonging.
Why the Rules Still Cause Debate
FIFA eligibility rules try to balance two issues.
First, players should not be trapped by early youth appearances or friendly matches.
Second, national teams should not be able to recruit players with no meaningful connection to the country.
This balance is why FIFA requires nationality and regulates when a player can make a one-time switch.
Conclusion
Diego Costa could play for Spain because he had Spanish nationality and had only represented Brazil in friendly matches.
His switch was legal under FIFA rules because he had not played a binding senior competitive match for Brazil.
The case remains a useful example of how nationality, residence and competitive appearances shape international football eligibility.
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