[4] After Boban Dmitrović's and Rašo Babić's retirements, Marušić started the 2012–13 Serbian First League season as a centre-back, pairing with Nemanja Miletić.
During the first half season, Sloga have many problems in defense, because of insufficient experienced players and a lot of goals conceded.
New coach, Neško Milovanović brought Nenad Živanović for the second half-season,[5] who played 7 matches, and then he left the club because of private causes,[6] so Marušić returned on the stopper place.
[9][10] Making solid performances in previous season, Stefan Drašković continued playing as a centre-back, along with Nemanja Miletić.
[16] After his request was denied as groundless, he apologized to teammates and supporters and returned in the first team squad in 4th spring fixture.
[19][20] After Sloga's permission to all players for leaving the club,[21] Marušić moved on loan to the Serbian SuperLiga side Voždovac along with Dragoljub Anđelković.
[22] He acquired condition to play in 3rd fixture of the 2014–15 season, against Rad, when he was substituted in for Ognjen Damnjanović on the beginning of second half.
In the winter break off-season, Marušić left the club and spent some period on trial with Zlaté Moravce.
[33] Playing for the club, Marušić made 7 appearances in Premier League of Bosnia and Herzegovina,[3] scoring 1 goal in away match against Borac Banja Luka.
[34] In summer 2016, Marušić was related with Borac Banja Luka,[35] but he started training with new Premier League club Krupa.