Maresca has been gradually introducing the highly-rated Brazilian teen this season.
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He has already made seven appearances for the Blues – three off the bench – and Maresca rated his start to life in SW6.
"He is doing very well," said Maresca ahead of tonight's Champions League tie with Benfica. "We have already said it’s not easy to come to Europe at 18 years old at a big club like Chelsea and show immediately the quality he has.
"We are very happy with him.
"He’s a very good boy, he’s happy, and he’s what we need in terms of energy."