The 22-year-old, who won his first international cap on Sunday in a friendly against the United Arab Emirates, will arrive at Elland Road shortly, according to his club Slavia Prague.
Kozacik, a former Slovakian Under-21 international, joined top-flight Czech team Slavia Prague in 2002 from Slovakian club Kosice.
He has UEFA Cup experience and started in 15 league games for Slavia Prague, who finished second in the Czech league this season.
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