Nani has been linked with great rivals Porto this season.
He told United Review: "I have Portuguese TV at home so I can watch a lot of games. I also had an opportunity when I was injured recently. I went back to Portugal for some treatment and spent two days at Sporting. I went to watch my old team play, I saw some friends and I visited the training ground.
"It was really enjoyable and it's nice to remember where you come from. Everybody was happy for me and wished me luck here in Manchester."