Rubuta ci gaba don wannan sakin layi - Šulák ya wakilci Jamhuriyar Czech a gasar zakarun duniya ta 2012 ta IIHF U18, inda ya yi rikodin taimako uku a wasanni shida. Šulák ya wakilci Jamhuriyar Czech a Gasar Hockey ta Junior ta Duniya ta 2014
, inda ya yi rikodin babu maki a wasanni biyar.