The 27-year-old has featured sporadically at Old Trafford in recent seasons and has been tipped to leave, with the player not dismissing a move to his home nation
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And now Nani, who initially joined United from Sporting Lisbon in 2007, could be set to move on from the club with a return to his home country a possibility.
"I'm a United player but there has been some interest on my behalf," he is quoted as saying in The Guardian.
"I will evaluate it and decide what is the most advantageous [course of action] for me.
"A return to Portugal? Right now I don't know."
In April, the player's agent had claimed he was "likely to leave Manchester", after responding to claims that there had been interest in his services from Italy and, notably, Fiorentina.
Nani started all three of Portugal's matches at this summer's World Cup, scoring in a 2-2 draw with the United States, but his team failed to make it through the group stages after finishing behind Germany and USA in Group G.