Career
Slončík played in the position of midfielder-playmaker. He spent most of his career at Baník Ostrava. In 2000 he moved to Sparta Prague, but he was not very successful and returned to Baník the next season.
He was a squad member in Baník Ostrava"s 2003-2004 championship season.
After the 2010/2011 season, Slončík retired from professional football.