The arrests came less than a week before the club holds presidential elections, and added to the turmoil surrounding the team recently.
Former FC Barcelona president Josep Maria Bartomeu has been arrested in a case related to 'Barcagate' at Camp Nou.
Midfielder Sergi Roberto has signed his contract renewal with Barcelona, a deal that runs until 2022.
Messi lifted the mood at the crisis-ridden Barcelona with a double in a 3-0 thrashing of Juventus in Champions League.
In interviews with Catalan newspapers Mundo Deportivo and Sport, Bartomeu claimed Barca would be better off without Neymar this season following his PSG Move.
Barcelona president Josep Maria Bartomeu insisted no player is bigger than the Catalan giants on Monday.