Rubuta ci gaba don wannan sakin layi - An zabi Hollenstein a cikin tawagar 'yan wasan Switzerland U20 don gasar zakarun duniya ta 2019
a ƙasar Kanada. Ya jagoranci Switzerland zuwa matsayi na hudu, ya fadi zuwa Finland a wasan kusa da na karshe. Hollenstein ya sake kasancewa cikin ƙungiyar don Gasar Zakarun Duniya ta Junior ta 2020 a Jamhuriyar Czech.