The Brazilian full-back was signed from Fluminense back in January and was allowed to stay there on loan until this summer.
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Mourinho told reporters: "He's a very good player but he won't be staying with us because we have [Branislav] Ivanovic and [Cesar] Azpilicueta for the same position.
"Because he is non-EU, we'll not get the work permit, 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. 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.
"So 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."