Born in Masthugget, Gothenburg, Sweden, to a Cuban father and a Swedish mother, Armenteros moved to the Netherlands at age 16 to join SC Heerenveen's youth system, and made it into the first team under head coach Gertjan Verbeek.

He was successively released by Heerenveen in 2009, and later chose to rejoin Verbeek at Heracles Almelo, where he showed himself as a promising striker and managed to score his first Eredivisie goals.

In September 2015, Armenteros signed a two-year contract with reigning Azerbaijan Premier League Champions FK Qarabağ.

[14] On 29 February 2024, Armenteros joined Chinese Super League club Shenzhen Peng City.

[17] Armenteros made his competitive international debut for Sweden on 31 August 2017 in a 2018 FIFA World Cup qualifier against Bulgaria when he replaced Jakob Johansson in the 82nd minute of a 3–2 loss.