While Guardiola provided the tactical inspiration, it was Diego Simeone at Atletico Madrid who defined Luís defensive discipline and mental toughness. The Brazilian credited "El Cholo" with revolutionising his understanding of accountability on the field, though he admitted the Argentine’s intense style has stayed with him in unexpected ways.
Reflecting on his time under Simeone, Luís explained: "With Cholo it was the first time I entered the pitch and knew when I was at fault and when I wasn't. His command is so imposing that to this day I have nightmares about him scolding me. But at the same time, he is a person who talks to you and knows how to reach you. At that moment I thought, I'm going to be like Cholo."