	On 7 July 2018, Posavec returned to the Croatian First Football League, signing for HNK Hajduk Split on a one-year loan deal. Posavec made his debut for Hajduk on 26 July 2017 in a 1-0 victory over PFC Slavia Sofia in the second round of 2018-19 UEFA Europa League qualifying phase, earning plaudits for his performance. Posavec made 33 appearances for Hajduk in all competitions.