You don't need to know much Spanish. Most of the time they talk about irrelevant things like the score from a USSR-Yugoslavia game. The main words are: "gol", "golazo" (great goal), "esquina" or "corner", "falta" (foul), "mediocampo" (midfielder). I have to watch a game to refresh my memory. I'm sure you can find glossaries on the internet.
Telemundo also shows the occasional international match, including this year's World Cup.
I remember having to watch the World Cup in Spanish because the English-language feeds were awful, cutting to ads and showing a whole-screen graphic after a kickoff.