The 26-year-old winger believes he could yet stay at Old Trafford this summer and has ruled out a return to play in Portugal.
The 26-year-old’s contract at Old Trafford runs out in the summer of 2014, with no new deal yet in place in for the Portugal international.
And with David Moyes becoming the new manager at the Manchester club, Nani insists a decision has yet to be made on his future.
"My future? Nothing is certain," Nani told reporters. "I am calm. I have everything in my hands.
"I am not saying that I will not continue at Manchester United. I will think about what is best for me."
Nani moved to Old Trafford from Portuguese side Sporting Lisbon in 2007 and has made 133 appearances for the Red Devils, scoring 26 goals.
And despite only appearing 10 times in Premier League last season, the midfielder has ruled out a move back to Portugal.
"I have respect for the Portuguese clubs, especially Sporting Lisbon but also Benfica and Porto, but I don't think that is viable," Nani said. "I think my level at the moment is different."