Rubuta ci gaba don wannan sakin layi - Bayan lashe gasar zakarun Turai ta U21 ta 2015, kungiyoyi da yawa sun nuna sha'awar dan wasan tsakiya na Sweden. Ya koma kungiyar Italiya ta Palermo akan Yuro miliyan 2 (tare da Yuro 500,000 a cikin kari), ya sanya hannu kan kwangilar shekara huɗu. A cikin "Rosanero", ya haɗu da abokin aikinsa na U21 Robin Quaison. Ya rubuta burinsa na farko a Serie A a ranar 13 ga Satumba 2015 a kan Carpi, wasan da ya ƙare a 2 × 2 wasa. Kwana shida bayan haka, ya zira kwallaye biyu a kan Milan, inda ya daidaita wasan sau biyu kafin a yi rashin nasara 2 zuwa 3. Kyakkyawan farawa na Hiljemark zuwa kakar ya jawo hankalin manyan kungiyoyi. An danganta shi da manyan 'yan wasan Italiya Milan da Napoli don yiwuwar canja wuri, da kuma kungiyoyin Premier League Norwich City, Southampton, Watford da West Ham. Zuwa karshen 2015<unk>16 Serie A
a wannan kakar, Palermo ya yi kama da haɗarin da za a sauke shi. A wasan karshe na kakar wasa, Hiljemark ya ba da taimako mai mahimmanci ga Franco Vázquez a cikin nasara 3<unk>2 a kan Verona don tabbatar da Palermo a kakar wasa ta 2016<unk>17 Serie A. Hiljemark ya buga wasanni 38 na Palermo a wannan kakar.