haʊˈɛvɚ, dˈʊɹɹɪŋ siːˈɛɹəz ʃˈɔːɹt tˈaɪm ɪn spˈeɪn, ðə tˈiːm hæd ˌiːkənˈɑːmɪk pɹˈɑːbləmz wˌɪtʃ kˈɔːzd hˌɪm tə ɹᵻtˈɜːn tə jˌuːnɪˈɑːn ɛspɐnjˈoʊlə.
However, during Sierra's short time in Spain, the team had economic problems which caused him to return to Unión Española.