World Cup - Playing for Your Countries at the World Cup?

Competing in the World Cup for 2 different countries might sound impossible, but it's not! 

Over the years, a handful of players have represented their country in the World Cup, changed nationality, and then played in a subsequent World Cup for their "new" country. 

The 5 are Monti (Argentina 1930, Italy 1934), Ferenc Puskas (Hungary 1954, Spain 1962), Santamaria (Uruguay 1954, Spain 1962), Mazzola (Brazil 1958, Italy 1962) and Robert Prosinecki (Yugoslavia 1990, Croatia 1998)!