The 19-year-old, who joined from Fluminense for around £4m last December and spent the second half of last season on loan back at the Brazilian club, won the London club's penalty in the 1-0 victory over Singha All-Stars on Wednesday but may not qualify for a work permit given he has yet to represent his country.
"He's a very good player," said José Mourinho. "I knew him before. He's very mature for his age, comfortable with the ball. He has the quality of a Brazilian full-back, likes to attack and create.
"He's a good player and he won't be staying with us, because we have [Branislav] Ivanovic and [César] Azpilicueta for the same position. He's also non-EC so we'll not get the visa, it'll be too early, so he'll go on loan for a season.
"We'll get the best option for him, in Europe. We want him to adapt. We'll see the best of him: he has talent and is one more investment for this club, a good investment, because the kid is a very good player."
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