Born in Bissau, Guinea-Bissau, Marciano played for local MEPA Academy as a youth. His talent wouldn't go unnoticed as in 2019, he was offered to go to Portugal to play for Gil Vicente and later on for Leixões.[2]
Almería
On 22 January 2022, Marciano signed for UD Almería B on an undisclosed fee with his contract expiring in 2024 and a release clause of 40 million euros.[3][4] He made an impressive start to his B team career by scoring two goals against CD Intergym Melilla within just three minutes of coming on as a substitute, with one goal in the 31st minute and the other in the 60th minute of the match.[5] He maintained his prolific form and emerged as the top goalscorer for his team, despite starting only ten games in the season. He scored in five consecutive games.[6]
Marciano began the 2023 pre-season with the first team,[7] but suffered an injury which kept him out until September.[8] He made his professional – and La Liga – debut on 6 October 2023, replacing Ibrahima Koné in a 3–0 away loss to Athletic Bilbao.[9]
Marciano is described as having good off-ball movements and dribbling that help him beat the opposition.[14] He has good passing which is most effective when in the opposition box, making him a more complete forward.[14]