The Brazilian midfielder has struggled since his arrival.
"He is lacking a bit of confidence," Reja said. "But during the week he shows the qualities he has.
"Now he has to take advantage of the chances he gets in matches.
"If he plays tomorrow we will also see his personality.
"He maybe has a little bit of fear about making mistakes but he mustn't think about this because he has all the trust of his teammates and coaching staff."
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