Marušić was born in Nuremberg, Germany, and started playing football at the age of five.
[1] Later he joined the youth academy of German Bundesliga side FC Bayern Munich at the age of fourteen on 2017.
He started his professional career with German side Bayern Munich II.
The first time for a 2–0 home win UEFA Champions League stage group match against Italian Serie A club Inter Milan on 1 November 2022.
[4] Marušić has regarded Spain international Sergio Ramos as his football idol.