The Spanish champions were eliminated at the quarter-final stage of the Champions League by Atletico Madrid last week, before losing 1-0 to Granada in La Liga at the weekend.
Defeat in the Copa del Rey final against Real Madrid on Wednesday would leave Barcelona with the possibility of a trophiless season.
"Barcelona have been without a coherent for years," he told Jutarnji List.
"[The players] have been under bad influences from under the dressing room. Over the past four or five years there have been catastrophic errors in the management."
It is currently unclear whether Gerardo Martino will still be in charge next season.