Kammala jumla mai zuwa: Bayan wakiltar Jamhuriyar Czech a fannoni da yawa na matasa, Souček ya fara bugawa babbar kungiyar wasa a ranar 15 ga Nuwamba 2016 a wasan sada zumunci da Denmark. Ya fara wasan sa na farko a ranar 10 ga Yuni, 2017, a wasan da Jamhuriyar Czech ta yi da Norway a wasan neman shiga gasar cin kofin duniya ta 2018. Souček ya bayyana a duka wasanni uku na Czech Republic karkashin-21 tawagar a gasar zakarun Turai.
Gasar Zakarun Turai ta 2017 ta 'yan kasa da shekara 21.