After starting professionally with local Gremio Foot-Ball Porto Alegrense, Prass joined Associação Atlética Francana in 2000, moving after one season to another modest side, Vila Nova Futebol Clube. In 2002 he signed for Coritiba Foot Ball Club, spending four seasons at the club. Subsequently, Prass moved abroad and joined Portugal's U.D. Leiria, as compatriot Helton had left to join FC Porto in the Primeira Liga. He made his league debut on 11 September 2005 in a 0–0 home draw against C.S. Marítimo, and retained first-choice status from that moment onwards.