Diego Costa has refused to train this Thursday according to AS. Atletico Madrid have opened disciplinary proceedings against the striker who is currently sitting out an 8-match ban.
Costa did go to the training ground but refused to take part in the session alongside his teammates. The club have confirmed that the Brazilian-born Spaniard isn't injured.
The Madrid based newspaper 'AS' broke the news and revealed the club are investigating the matter.
Costa is serving an 8-match ban after using abusive language towards the official and later grabbing him. It's worth remembering that the forward committed a similar offence when on Chelsea's books after he demanded to move to Atletico.