David de Gea joined Manchester United as a 20-year-old in the summer of 2011 for £18.9 million, a British record fee for a goalkeeper.
But De Gea struggled for consistency before breaking through as a key member of the 12-13 title winning club.
“Sometimes it was difficult when you get a lot of criticism like I did,” De Gea admitted. “But I kept strong and I always tried to remain positive. I loved training. It was a great pleasure, so I just did my work and worked through it.
“Those early days were difficult for me and my family. But when you play for a big club like Manchester United it is normal when you don’t play well. Yes I am glad it happened in some ways because the criticism makes you stronger. A goalkeeper is a difficult position and you make mistakes. It is normal. But you have to be strong in your mind to get through it all and get better.”