For they will possibly be going head-to-head in the World Cup group stage as the USA and Poland are in the same pool.
The big Pole was a surprise addition to the Reds' squad in September when Gerard Houllier splashed out on two new goalkeepers on the same day to replace popular Dutchman Sander Westerveld.
Dudek signed on from Feyenoord and England under-21 keeper Chris Kirkland joined from Coventry City. While the young Englishman has enhanced his reputation on the rare occasions he's been called on, it is Dudek that has created a massive impression and many pundits have described him as the best keeper in the Premiership.
His form and style of goalkeeping has not escaped the notice of Kasey.
"Yeah Dudek, they've been kind of wanting that," said our current guardian of the goalposts. "I know a lot of the fans were happy with Westerveld but they decided to make a big change at the beginning of the season.
"Look what's happening, Dudek's come in and made that position his own. He is a good solid keeper who I'll be coming up against in the World Cup as well."
Pretty much like Kasey, Dudek is an uncomplicated keeper who concentrates on doing the simple things well rather than always opting for the spectacular.
"We're kind of from the same school," agreed Kasey. "He likes to hold things, come for a cross when it's in the air and will be aggressive coming out at people's feet as well.
"It was a position at Liverpool that the management kept talking about, they wanted someone to make it their own and I think he finally has."
Kasey Keller will be hoping that Saturday's encounter with Liverpool will not be the only time he faces his Anfield counterpart Jerzy Dudek before next season.