He is a Slovakian U21 International.
The following was posted on http://futbal.pravda.sk/
Slovenský futbalový reprezentant do 21 rokov Filip Kiss odchádza zo Slovana Bratislava na sezónne hosťovanie do waleského klubu Cardiff City, ktorý pôsobí v druhej najvyššej anglickej súťaži.
Which translates to
Slovak football national team in 21 years Filip Kiss departs from Slovan Bratislava for the seasonal loan to the Welsh club Cardiff City, which operates the second highest in the English competition.
The player goes on to say:
"It all happened very quickly. Honestly say that even I myself did not expect that things could gain such momentum. Cardiff had me interested for a long time ago, but until now they have. Three days ago I learned that it would could come, but I did not want to talk about it until they have resolved the major transfer points. Slovan not want to let go of me to change the clubs finally agreed on an annual hosting, "said Captain Slovakia" dvadsaťjednotky "the club website.
So we have a new player and no one knows anything about him.