As the governing body of association football, FIFA is responsible for maintaining and implementing the rules that determine whether an association football player is eligible to represent a particular country in officially recognised international competitions and friendly matches. In the 20th century, FIFA allowed a player to represent any national team, as long as the player held citizenship of that country. In 2004, in reaction to the growing trend towards naturalisation of foreign players in some countries, FIFA implemented a significant new ruling that requires a player to demonstrate a "clear connection" to any country they wish to represent. FIFA has used its authority to overturn results of competitive international matches that feature ineligible players. FIFA instituted a comprehensive revamp of the eligibility system in January 2021, giving players who might otherwise have been tied to a nationality through junior representation or even full national team caps the ability to switch to another nation. History Historically, it was possible for players to play for different national teams. For example, Alfredo Di Stéfano played for Argentina (1947) and Spain (1957–61). Di Stefano's Real Madrid teammate Ferenc Puskás also played for Spain after amassing 85 caps for Hungary earlier in his career. A third high-profile instance of a player switching international football nationalities is José Altafini, who played for Brazil in the 1958 FIFA World Cup and for Italy in the subsequent 1962 FIFA World Cup. Other 20th-century examples of players representing two or three separate countries are: Ernst Wilimowski – (Poland and Germany) Joe Gaetjens – (United States and Haiti) László Kubala – (Czechoslovakia, Hungary and Spain) Raimundo Orsi – (Argentina and Italy) Luis Monti – (Argentina and Italy; the only person who played in two World Cup final matches for two different teams) José Santamaría – (Uruguay and Spain) Alberto Spencer – (Ecuador and Uruguay) Paulino Alcántara – (Philippines and Spain) This does not include the hundreds of players whose teams were affected by changes to geopolitical borders e.g. East Germany/Germany, Soviet Union/Ukraine, Yugoslavia/Croatia. Furthermore, some international players have played for another FIFA-recognised country in unofficial international matches, i.e. fixtures not recognised by FIFA as full internationals. This category includes: Daniel Brailovsky, who played for Uruguay youth teams, was featured in camps for Argentina and years later officially represented Israel. Debatik Curri, an Albania international, played in a friendly for Kosovo in 2014, during the period when they were allowed