Born in Gijón, Asturias, Manjarín began playing professionally for local Sporting de Gijón, first appearing with his hometown squad during the 1989–90 campaign (29 games and four goals).
Manjarín, born in Gijón, Asturias, started his professional career with Sporting de Gijón, making his debut with the club during the 1989-1990 season. He played 29 matches and scored four goals for the team.