ɹˈoʊhɑːs ɹˌɛpɹᵻzˈɛntᵻd tʃˈɪli æɾ ˌʌndɚ twˈɛnti lˈɛvəl ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti θɹˈiː ɐlˈɔŋsaɪd plˈeɪɚz sˈʌtʃ ɐz klˈɔːdɪˌoʊ lɪzˈɑːmə, klˈɔːdɪˌoʊ vˈɪlən ænd mɑːɹsˈiːloʊ sˈɑːləz.
Rojas represented Chile at under-20 level in 1993 alongside players such as Claudio Lizama, Claudio Villan and Marcelo Salas.