Distrito de Coímbra
Born in Lousã, Coimbra District, Seco represented four clubs as a youth, finishing his development with Associação Académica de Coimbra after signing in 2004. He spent his first seven seasons as a senior in lower league or amateur football, including two with Sport Benfica e Castelo Branco and one in the Maltese First Division with the St. Lawrence Spurs.