in 2000, didulica was selected to the australian squad for the sydney olympics, but had to withdraw due to injury and never received an international cap for the australian national team at a-level. in 2004, he decided to play for the country of his parents. according to didulica, his decision was based on the fact that he had not been selected to represent australia by then coach frank farina. additionally, australia had not qualified for a world cup for around 30 years and he saw more opportunities for success with croatia, who qualified for both world cups they entered at the time.