[4] Erceg made his Hajduk debut on 17 July, playing 45 minutes in a 2–0 win over HNK Cibalia in the first day of the Prva HNL.

[15][16] Erceg joined Croatian First Football League club NK Osijek on 19 August 2020, on a season-long loan with an option to buy.

[17][18] The following April, the Croatian club announced they will not be buying Erceg, but that they are looking into options of retaining his services for the future.

[11] On 25 May 2022, Erceg signed a one-year contract with Hungarian Nemzeti Bajnokság I club Debreceni VSC, with an option for one further year.

[22] Erceg joined Croatian Football League club Istra 1961 on 1 August 2022, signing a one-year deal.

[24] On 26 August, Erceg scored his first goals for Istra, a brace, after coming on as a 66th-minute substitute for Monsef Bakrar to secure a late 2–0 away victory against Gorica at Stadion Radnik.

[25] He would also score in three consecutive games in September 2022, against Lokomotiva,[26] Slaven[27] and his former side Hajduk[28] to bring his league goal tally to five in six appearances.