Valera scored his first senior goal on 13 October 2019, scoring his team's third in a 3–0 home defeat of Coruxo FC.[5] He made his first team – and La Liga – debut the following 4 January, replacing João Félix late into a 2–1 home success over Levante UD.[6]
On 1 February 2021, Valera renewed his contract until 2026 and moved to Segunda División side CD Tenerife on loan for the remainder of the season.[7] On 11 August, he moved to fellow second division side Real Sociedad B on a one-year loan deal.[8]
On 25 August 2022, Valera joined FC Andorra also in the second level, on a one-year loan deal.[9] On 8 August of the following year, he moved to fellow league team Real Zaragoza also in a temporary deal.[10]
On 30 August 2024, Valera signed a four-year contract with Valencia CF in the top tier.[11]