Newell's Old Boys Valenzuela is a youth exponent from
Newell's Old Boys, having joined the club at the age of 14. He broke into the first team at the age of 17, making his
league debut on 6 February 2016 against
San Martín de San Juan in a 2–1 away defeat in
Rosario. While never becoming a permanent feature with the first team after his break through, Valenzuela made 13 league appearances for the club, along with 3 cup appearances, over three seasons. Because of his youth and lack of playing time, on January 26, 2018, Valenzuela was sent on a year long loan to
Columbus Crew SC of
Major League Soccer, with an option to buy at the end of the loan. After a successful season with
Columbus in
MLS, the Crew exercised their purchase option at the end of the 2018 season and Valenzuela ended his time with his boyhood club.
Columbus Crew Valenzuela made his debut for Columbus on 3 March 2018, playing 90 minutes in a 2–0 win against
Toronto FC. He scored his first professional goal on 24 March 2018 in a 3–1 win against
D.C. United. Over the course of the season he made 30 appearances with 29 starts. However, despite an encouraging preseason, Valenzuela suffered a tear in his
ACL during training and would be out for the entirety of the
2019 season. Valenzuela returned from injury for Columbus during the
2020 season. He made a total of 24 appearances and was part of the team that won the
2020 MLS Cup. During the 2021 season, Valenzuela played in only 14 of the Crew's 34 regular season games, dealing with hamstring issues throughout the majority of the year. On April 28, Valenzuela scored his only goal of the season against
Monterrey in the
2021 CONCACAF Champions League quarterfinal.
Lugano On 30 January 2022, Valenzuela signed a contract with
Lugano in Switzerland until 30 June 2025.
Independiente On 15 July 2025, Valenzuela returned to Argentina to join
Independiente as a free agent, signing a contract until the end of 2026. == Personal life ==