The Brazilian full-back has hinted his future may lie away from Old Trafford after falling down the pecking order since his return from a lacklustre loan spell at QPR
The 23-year-old Brazilian defender has seen his twin brother Rafael make the right back position his own at Old Trafford, but Fabio has fallen behind Patrice Evra and Alexander Buttner in the pecking order at left back.
Fabio, who spent last season on loan with Queens Park Rangers, admits a potential return to Fluminense, the club he and his brother left to join Manchester United five years ago, could be on the cards.
"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," Fabio said. "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 with my family. I may go back to Brazil, or maybe not, I'm checking with my agent 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."