While still playing for the U21 national team, he also made his full international debut for Croatia in a friendly match against Greece on 25 April 2001 in Varaždin, where he came on as a substitute for Boris Živković in the 88th minute.

His competitive international debut for Croatia came on 15 November 2003 in the UEFA Euro 2004 qualifying play-offs against Slovenia, where he played the entire 90 minutes in the first leg in Zagreb, which ended in a 1-1 draw.

He was also part of the Croatian squad at the UEFA Euro 2004 finals in Portugal, but did not appear in any of the team's three group matches before they were knocked out of the tournament.

After the UEFA Euro 2004 finals, he only appeared in 4 international friendlies for Croatia, including both of their matches at the 2006 Carlsberg Cup in Hong Kong.

[5] On 28 September 2018, after Feđa Dudić got sacked, Neretljak was named the new manager of Bosnian Premier League club GOŠK Gabela.

In July 2022, Neretljak was appointed as manager of Croatian Second League club NK Rudeš, ahead of the 2022–23 season.

In mid September 2022, five fixtures into the season, when Rudeš were second in the table behind HNK Vukovar 1991 only on goal difference, Neretljak was sacked due to unsatisfactory early performance.