The United title winner was sold to Fenerbahce last year before joining Los Che this past summer.
Nani told ESPN: "United were my team, my home. There I earned all my successes, learned most of what I can in this life and won titles.
"I wanted to stay there, but I wanted to play.
"When I joined, the idea was that I would play as often as possible, but that did not happen. So I took my decision and chose to be happy, to enjoy life and football. I was very happy with my decision."