Vega made his qualifiers debut in a 1–0 away win over Ecuador at Estadio Olímpico Atahualpa in Quito, his most successful and significant career match, then lost then against the Argentina national football team in the Estadio José Pachencho Romero with goals of the footballers of Barcelona, the centre back Gabriel Milito and the striker Lionel Messi, missing the following qualifier games against Bolivia and Colombia, in where was replaced by the keeper Leonardo Morales, returning in a 1–1 away draw with Uruguay at the Estadio Centenario of the capital Montevideo, in where received a header goal of Diego Lugano. On 12 October 2008, Vega made his most poor performance in the qualifiers against Brazil conceding four goals in a 4–0 home win at the Estadio Polideportivo, receiving the same number of goals in March of the next year against Argentina at Buenos Aires.
