The 26-year-old forward, who joined Manchester City after making the controversial switch from rivals United last summer, revealed he is feeling homesick and is looking forward to moving back to Argentina.
“There is only a little time remaining before I retire,” he told TyC Sports. “It is very difficult to play football if you are not happy. I am finding it very difficult to recover since the World Cup.
“I dreamt of returning to Argentina with the trophy. There were no fights in the World Cup, everything was positive, but it was the hardest thing that I’ve ever had to experience.
“Every day I have less will to continue playing in Europe and to carry on playing football. I will be there for two or three more years and then I will think about heading back to Argentina.”
He added: “For the last year, I haven’t lived with my daughters. They are growing up and I’m getting worn down. After returning from South Africa, I thought about quitting football, but I have a large family and now I have to continue.
“Football doesn’t make me as happy or as fulfilled as before. It becomes difficult to play like this.”
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news