Martínez, who trained in the Huracán youth system, debuted with Huracán's first team in the 2011–12 season. While at the club, he won his first Copa Argentina in 2014.
On 9 December 2018, Martínez scored his side's third goal to seal a 3–1 win, 5–3 aggregate victory, over Boca Juniors in the second leg of the Copa Libertadores held at Real Madrid's Bernabéu Stadium.[4] Following the victory, he announced that he would be joining MLS side Atlanta United after the FIFA Club World Cup, as the club had met his $17 million release clause.[5]
On August 24, 2023, River Plate announced that it had re-signed Martinez.[12]
International career
On 8 September 2018, Martínez made his Argentina national team debut in a 3–0 victory over Guatemala.[13] He started the match, scored from the penalty spot after a handball by Elías Vásquez midway through the first half, and was replaced by Franco Vázquez in the 56th minute.[14]
Personal life
His nickname, Pity, refers to the wren ("pititorra"), from his native homeland of Guaymallén, in Mendoza, Argentina. He was given the nickname at the age of five, and does not respond to his given name, Gonzalo.[15]