Romania was the country that was unprepared prior to the first World Cup in 1930. Their football-mad monarch King Carol II took responsibility for ensuring Romania participated by selecting the players and arranging the team.
Inter Milan and Bayern Munich are the two clubs that have consistently supplied players to World Cup finals since 1982. The player that transferred between them and scored in the 2018 World Cup final was Mario Mandzukic.
José Altafini, also known as Mazzola, played for Brazil when they won the 1958 World Cup but opted to play for Italy in 1962, missing out on the chance to win two World Cups back-to-back with Brazil.