Often viewed as undersized, at age 20, Monteiro's footballing skills eventually landed him the opportunity to join the U21 system at FC Dordrecht.

He made his debut on 19 September 2015, in a home match against FC Twente (0–0), coming on as a substitute for Jack Byrne in the 61st minute.

[2] Monteiro was awarded a Bronze Ball in March 2017, after coaches, captains and supporters of the Eerste Divisie clubs voted him the best player of the third period of the 2016–17 season.

[4] On 18 April 2018, Monteiro scored two stoppage time goals, including a last minute penalty, to help Heracles draw 2–2 with Excelsior Rotterdam.

[7] On 3 August 2018, Monteiro made his debut for Metz in a 5–1 victory over US Orléans, coming on as a substitute for Ibrahima Niane in the 66th minute.

[20] On 7 October 2021, Monteiro scored his first national team goal during the second round of the 2022 FIFA World Cup qualification: an equalizer versus Liberia.

[24] In December 2023, Monteiro was named in Cape Verde's squad for his second Africa Cup of Nations – the 2023 tournament in the Ivory Coast.

[25] He scored Cape Verde's opening goal of the tournament in the 17th minute of the team's 2–1 win over Ghana in their first Group B match.