[2] On 30 July 2016, he moved abroad and agreed to a four-year contract with Deportivo de La Coruña.

[3] Martelo made his senior debut with the reserves on 16 April 2017, coming on as a late substitute for Pinchi in a 1–0 Tercera División home win against Céltiga FC;[4] it was his only appearance of the campaign, as his side achieved promotion.

[5] He made his professional debut on 19 April, replacing Denisson Silva in a 0–1 away loss against Varzim S.C.[6] On 26 August 2020, Martelo signed a three-year deal with F.C.

[10] On 29 July 2022, it was reported that Martelo had terminated his contract with Paços de Ferreira by mutual agreement.

On 13 July 2023, Irish club Sligo Rovers announced the signing of Martelo on a deal until the end of the 2023 season, with the option to extend the contract for a further year.