siːˈɛɹə ɐnˈaʊnst hɪz ɹᵻtˈaɪɚmənt ɪn dᵻsˈɛmbɚ tˈuː θˈaʊzənd ˈeɪt ænd ɐksˈɛptᵻd ðə pəzˈɪʃən ʌv mˈænɪdʒɚ wɪð hɪz bᵻlˈʌvd jˌuːnɪˈɑːn ɛspɐnjˈoʊlə.
Sierra announced his retirement in December 2008 and accepted the position of manager with his beloved Unión Española.