Jürgen Klopp
Since leaving Borussia Dortmund, Santana has been critical of Jürgen Klopp, describing him as "stupid". In response, the club's CEO Hans-Joachim Watzke expressed anger towards him, calling him unprofessional. Despite being critical towards Klopp, Santana described leaving Dortmund for Schalke as a "hard decision", due to the rivalry between two clubs.