Here is list of World Cup-related terms. They might be useful if you decide to start watching all the games at work in order to talk about them in your conversation classes at Berges.
El Mundial/La Copa del Mundo – the World Cup
Clasificarse – to qualify
La fase de grupos – the group stage
La eliminatoria – the knockout stage
Los cuartos de final – the quarter-finals
Las semifinales – the semi-finals
La final – the final
El tercer y cuarto puesto – the third place playoff
La selección nacional – the national team
La sede – the host
El estadio – the stadium
El campeón – the champion
La copa – the cup
La medalla – the medal
La vuvuzela – the vuvuzela
Los penales/los penaltis – the penalty shoot-out
Muerte súbita – sudden death
Tiempo de descuento – injury time
La prórroga – the overtime
El gol de oro – the golden goal
El gol de plata – the silver goal
El gol de Iniesta en 2010 – this one

Bonus: Here’s a list of Spanish-speaking national teams you can root for:
Perú
Colombia
México
Costa Rica
España
Uruguay
Argentina
Panamá
Lastly, if you want to review your basic fútbol vocabulary, check out this article in La Eñe.