Rubuta ci gaba don wannan sakin layi - An haife shi a Ostiryia, Kalajdžić dan asalin Serbia ne. Ya fara bugawa Austria wasa a ranar 14 ga Oktoba 2020 a wasan Nations League da Romania. Ya maye gurbin Michael Gregoritsch a minti na 90. A ranar 25 ga Maris, 2021, ya zira kwallaye biyu na farko na kasa da kasa a wasan da suka yi da Scotland a lokacin gasar cin kofin duniya ta FIFA ta 2022. An saka Kalajdžić a cikin tawagar Euro 2020
, inda ya zira kwallaye a cikin rashin nasara 2<unk>1 bayan karin lokaci a kan Italiya a zagaye na 16.