[1] Valdez spent his early career in the lower leagues of Paraguay with Rubio Ñu, Herreros Bueno, and Deportivo Capiatá before moving to Sportivo San Lorenzo in 2016.
[2] He made his professional debut with Sportivo San Lorenzo in a 1-0 Paraguayan Primera División win over Club River Plate on 22 January 2019.
On 28 August 2023, Azerbaijan Premier League club Neftçi announced the signing of Valdez to a one-year contract with the option of a second.
[3] On 24 July 2024, Neftçi announced the departure of Valdez after the option on his contract wasn't taken up.
[4] Valdez made his debut for the Paraguay national football team in a friendly 1–0 loss to Peru on 22 March 2019.