United boss Sir Alex Ferguson recently revealed that he would be willing to allow the Brazilian to leave the club on a season-long loan basis.
Recent reports have claimed that Benfica would be willing to take the defender on a temporary basis and Fabio has conceded that he would be keen for the speculation to come true.
"I am excited about the opportunity to play for Benfica - a very famous and big club," Fabio told A Bola.
"I feel very honoured by Benfica's interest, but my transfer now depends on negotiations with Manchester United."
The 21-year-old has made 14 appearances in all competitions this season.