Unlike compatriot Nuno Santos, who hit the ground running at Chloorkop, Reisinho departed at the start of the 2026/27 campaign after making just 14 appearances for the Brazilians across all competitions.
Cardoso believes how quickly a player embraces a new environment can be crucial to their long-term success – especially in South Africa.
"Players need to be open hearted to adapt in a country that is completely different from theirs. As a coach, I love the differences between all the football cultures, and I love to experience new things and to go to places I've never been before so as to learn more about that country."
The coach suggested the 27-year-old could have worked harder on finding ways to familiarise himself with the pace of life on and off the pitch.
"If you start denying everything, and you don't dance in the locker room and you don't embrace the beauty of South Africa, then it will be more difficult for you. Sundowns never bring players in with no quality, it's never ever happened.
"The difference between places like Germany, France, England and Portugal is not so big, but when you come to South Africa there is a huge difference. The tempo of the game is also completely different."
Cardoso also questioned whether Reisinho made enough of an effort to be part of the group and build camaraderie with his teammates.
As a parting shot, Cardoso acknowledged that not every player recruited by Sundowns will be a success story.