Ariedo Braida, Barcelona's new international sporting director, was in attendance to scout Juventus' match against Borussia Dortmund in the Champions League.
Barça reportedly has interest in Paul Pogba and Marco Reus.
Barça are studying the possibility of registering footballers in the summer and playing them when the sanction ends in January 2016.
The process is also further complicated by elections at Camp Nou this summer.