Luka Ivanušec was born on 26 November 1998 in Varazdin, Croatia. He started his football career in the youth system of his local team before joining Lokomotiva Zagreb, where he made 92 appearances, scoring 10 goals and providing 13 assists.

He then moved to Dinamo Zagreb, where he played in 175 games, scoring 37 goals and providing 20 assists. He won four league titles, a Croatian Cup and two Super Cups, and was one of the most consistent and productive players on the team.

In the 2023–24 season, Feyenoord acquired his services. In his first attempt at playing outside Croatia, he recorded 55 appearances, four goals and seven assists, while celebrating a Dutch Cup and a Super Cup.

At international level, Ivanušec has made 22 appearances for the Croatian senior men’s national team, scoring twice and providing two assists, and has also participated in UEFA Euro 2020. He has also been a member of all of his country’s youth national teams.