Rubuta ci gaba don wannan sakin layi - Holmström ya wakilci Sweden a 2013 Ivan Hlinka Memorial Tournament, inda ya rubuta daya taimakawa a wasanni hudu. Daga baya ya wakilci Sweden a 2014 IIHF World U18 Championship
, inda ya kasance na biyu a cikin manyan 'yan wasan da suka zira kwallaye a lokacin gasar, inda ya zira kwallaye uku da takwas a wasanni bakwai. Holmström ya wakilci Sweden a Gasar Kofin Duniya ta Hockey ta Duniya ta 2015, inda ya zira kwallaye daya da kuma taimakawa shida a wasanni bakwai. Holmström ya sake wakiltar Sweden a Gasar Hockey ta Junior ta Duniya ta 2016, inda ya zira kwallaye guda daya da taimakawa biyar a wasanni bakwai.