He does acknowledge that football is not the all-consuming passion for many Americans that it is elsewhere, but even six per cent of of the USA's 200-odd million population is a fair few people.
"Then you have to look at the other 50m kinda illegal immigrants in the States that are from football following countries," Kasey added.
"It is unbelieveable the ratings that the World Cup and our team will get in the Spanish community, we'll get fantastic ratings and it's a big part of football in America that we're catering to and need to be catering to."
Kasey realises that the battle for football to win the hearts and minds of sports fans is fierce.
"The problem that you have is that there is too many things going on at the same time.
"While attention in England might centre on one big match, in the States you would probably have three or four huge play-off games in basketball, another three or four in hockey, a full gambit of baseball games - all these things going on and it's so regional.
"The country is so big - the size of Europe. So you think what is going on in England might not be the same as what is going on in Spain. That's basically what you're looking at, then you've got to think of college sports, there's just so much happening."
Kasey Keller rejects the findings of reported surveys suggesting that only about six per cent of the USA population are aware of the World Cup.