In 2007, he scored his 240th S.League goals in the Singapore Cup semi-final against Bangkok University to overtake Egmar Goncalves as the all-time S.League top goalscorer.
However, he was unable to pass the mandatory beep test twice, and served as caretaker coach for the Dolphins for a short period, starting with a 1–0 win over Gombak United which was Sengkang's second victory of the season.
He decided to leave Singapore on 5 October 2008 to rejoin his family in his native Croatia, renouncing his citizenship as well.
Grabovac started coaching in his native Croatia in 2009, taking charge of NK Mosor, replacing Davor Mladina.
[5] He succeeded Dragutin Ćelić at Junak Sinj in March 2017,[6] but was dismissed as manager of Junak in January 2018[7] and also in early 2018, Grabovac was announced as the new head coach of his former club Warriors, this would mark his return to his former adopted nation in a footballing capacity since he renounced his Singaporean citizenship.