Martinez has thrived in the early stages of the season under the leadership of coach Hansi Flick.
He told Club del Deportista: “I would say that I am in one of the best moments of my career. I am having the opportunity to play, which is something that every player wants.
"Last year was not easy, but this year the truth is that I am enjoying it to the fullest, the manager has trusted me from the first moment and now I am trying to maintain that level that I am giving.
"When you feel the confidence of the manager and your teammates, everything flows better. I feel good, happy about that first goal with Barcelona and my first goal in the Champions League, so I want to continue along this path, improving in all aspects and enjoying it."