Manchester United winger Nani admitted his future at the club was uncertain as speculation continues to mount he could be heading for the exit door at Old Trafford. The 26-year-old endured an inconsistent season as United reclaimed the Premier League title, falling down the pecking order as new boy Robin van Persie grabbed the limelight. And with only a year left on his contract, rumours are circling the club have slapped a £8.5 million price tag on the Portuguese international. But Nani said he is remaining calm despite the unclear nature surrounding his career. "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." However, Nani is confident he will not be returning to his native Portugal, believing he is playing at a different level than the Primeira Liga. "I have respect for the Portuguese clubs, especially Sporting Lisbon but also Benfica and Porto, but I don't think that is viable," he said. "I think my level at the moment is different."