"My life has been quite a story. There were tough times, growing up in Ejercito de los Andes which was nicknamed Fuerte Apache. When it was dark and you looked out of the window, what you saw would scare anyone.
"After a certain hour, you couldn't go into the street. It was incredible. I got broken teeth in a street fight in a row over money because in Apache, you always played football for money - even as a kid.
"It was a way of earning enough for food and drink, and because I was good, people would pay me to be in their team.
"The scars I have on my face, neck and chest happened when I accidentally pulled a kettle of boiling water over myself when I was 10 months old.
"I was in hospital for two months and, although I was only a baby, it was a defining experience - it marked me for life.
"That is why I won't have plastic surgery.
"Boca Juniors offered to pay for me to have the scars cosmetically improved and they were astonished when I said no.
"When they asked why, I told them, 'You either take me as I am or you don't'. The scars are part of who I was then and still am. The same goes for the teeth. I won't change the way I am.
"At United, the other players call me The Lion because I never take care of my hair - I just show up at training wearing it however it is when I get out of bed. But that's fine. At United I feel just like at home."