Career
Kvaček spent most of his playing career in the Czechoslovak First League, playing for FK Mladá Boleslav, Spartak Hradec Králové, TJ Jablonec nad Jisou and Football Club Slovan Liberec. He also had a brief spell playing in Australia for Sydney Prague. Overall, he appeared in 141 Czechoslovak First League matches and scored 52 league goals.
Following retirement as a player, he managed several clubs, including FK Mladá Boleslav in the second division in the 1975/76 season.
He also led the Czechoslovakia Olympic football team, and also coached teams in Malaysia and Singapore. He led Kedah FA into two Malaysia Cup finals, winning the 1990 final.
In Singapore, he had a brief stint as national team coach in 1992 and also coached the Singapore Lions in Malaysia Cup. Kvacek also worked as a technical director for SAFFC in the South.League from 1996 to 1997.
He died at the age of 76.