Answer
Defensa y Justicia was the club from which Martínez transferred to Ajax. Martínez, a promising young Argentine footballer, began his professional career with Defensa y Justicia in 2019. After impressing with his performances, he caught the attention of Ajax, one of the top clubs in the Netherlands. In 2022, Martínez completed his transfer to Ajax, where he has continued to showcase his talent and contribute to the team's success.