Born in Santa Cruz de la Sierra[2] as his father was playing in the country at the time, Monteiro started his career with a local football school named Toreto Garcia at the age of four.

Still, only two years later, he joined Proyecto Bolivia 2022, a project created to encourage the development of young Bolivian men's footballers.

[3][4] In late 2018, Monteiro moved to Brazil, signing with Santos at the same time as Proyecto Bolivia 2022 teammates Miguel Terceros and Christian Osinaga.

[5] Shortly after, the pair were joined by Leonardo Zabala, who Monteiro has known since he was nine, as their parents played football together in Bolivia.

[6] On 3 February 2025, Santos loaned Monteiro to FK Auda of the Latvian Higher League for the season.