Barcelona president Josep Maria Bartomeu has said midfielder Arthur Melo is facing disciplinary action after showing a "lack of respect" towards the club after refusing to return to training.
The Catalan club agreed to sell Arthur to Juventus in July with Miralem Pjanic arriving from the Turin club once the season is completed.
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However, Arthur failed to report to Barcelona for training on June 27 after a week off and remains in Brazil.