It is widely thought that the 22-year-old will never be seen again in England and that United will sell him if they can.
But the £7.4million signing from Guimaraes said this week: "Sir Alex advised me to leave and find a club where I could play more often, so that I could make a great return in the future.
"Obviously something went wrong in the last phase of my career. I had a serious injury which thankfully I have fully recovered well from.
"I'm fine physically now. I was always training and playing. It's good to come here and I want to show what I can do."