Brazil boss Dunga believes that the below-par form of Felipe Melo and Diego is down to Juventus' failure to manage the midfield duo. Brazil first-choice central midfielder Melo has been subjected to severe criticism recently, amid his failure to deliver the goods for the Old Lady so far. However, Dunga believes that Juve manager Ciro Ferrara is the one responsible for Melo's decline. "I don't understand. I ask myself: do Juve understand Felipe's technical characteristics?" the former Brazil skipper told Gazzetta dello Sport. "He is not a classic playmaker. He has never mistaken a game for Brazil. Ferrara has to have faith in Felipe. He has to speak to him and explain what Juve is. "There are few central midfielders as strong as Felipe in circulation around the world." Not Zidane Turning to the other Brazilian struggling in Turin, Dunga believes that Diego's inconsistency is due to the poor judgment in Italy. "In Italy there is no balance in the judgements. After the first month of the championship Diego was the new Zidane. Today he is any old player," he added. "Diego is not Zidane, he isn't even Platini. But even Platini and Zidane needed time to understand Serie A, right? "Diego is not a player who makes the team work by himself. To lift his fantasia he needs to be inserted into an orchestra that works. And right now Juventus have problems."