Early career Horkaš started playing football at his hometown club
Segesta, before joining
Dinamo Zagreb's youth academy in 2011. He made his professional debut against
Imotski on 11 December 2016 at the age of 17. In January 2020, he was loaned to Bosnian team
Zrinjski Mostar until the end of season. In June, his loan was extended for additional six months. In October, he was sent on a season-long loan to
Varaždin. In January 2022, Horkaš was loaned to
Posušje for the remainder of campaign. In July, he moved to Bulgarian side
Lokomotiv Plovdiv.
Las Palmas In June 2024, Horkaš signed a four-year deal with Spanish outfit
Las Palmas. ==International career==