The 23-year-old Brazilian defender has seen his twin brother Rafael make the right-back position his own at Old Trafford, but has fallen behind Patrice Evra and Alexander Buttner in the pecking order at left-back.
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"I don't know. I think the time has come and maybe in the next window or even next season, I think I might leave. There are good possibilities."
"I'm looking for other clubs. There's nothing certain, we'll leave it for later.
"I want to be happy. I want to play, I want to be close to my family. I may go back to Brazil, or maybe not, I'm checking with my manager to see what is the best for me.
"The affection I have for Fluminense is very big, for sure. I played there for seven years, and certainly if I have to go back to Fluminense I'm going with great pride because I have a special affection for them."