Goalkeeper David de Gea considered leaving Manchester United because of the criticism he received following his £18m move from Atletico Madrid in 2011.
When asked if he ever thought about leaving, De Gea, 23, said: "Sometimes.
"It's difficult when you get a lot of criticism. But I kept strong."
However, De Gea, who has now played more than 130 games for United, said overcoming the difficult period helped him improve as a keeper.
"What happened at the start helped me be the player and man I am now," added the Spain international.
"When you have bad moments you have to improve. You have to become stronger to deal with it and I believe I have become stronger. I am much better now."