De Gea, who joined Atletico Madrid's youth system at the age of 10, completed a 20 million euro move to Manchester United late last month.
The goalkeeper spent more than two seasons with the Atletico Madrid first team, winning the Europa League and European Super Cup as well as cementing his spot as the first-choice keeper and a fan favorite at just 20 years of age.
While his departure is saddening for Los Rojiblancos, De Gea issued a touching letter to the fans of the club, saying that he is thankful for everything he has received and that he would love to return to the club one day.
The full letter reads as follows:
"It’s been just over a week since I signed the contract with my new team. It seems like yesterday when I was four and joined for the first time Atleti in Casarrubuelos. From the plane I travel in to join Manchester United I remember with nostalgia, that this nostalgic feeling will be my traveling companion for a long time.
Like any child, every evening was accompanied by excitement and my parents (without their support none of this would have been possible) with the sole aim of defending the goal of Calderón someday.
A little over a year and a half I completed my dream and sealed it with two titles, I will never forget that feeling, I will never forget the people’s faces painted red and white. I can not forget neither the tears of Barcelona, behind the chants of support for us.
Today, 16 years later, I undertake a new challenge with the same enthusiasm of the boy and the eternal gratitude of a feeling, that only we understand, that I will carry forever in my heart regardless of the badge that adorns my chest.
I see from the airplane window how I leave behind my house, thanks to my new club for the opportunity it provides me with the security there to finish my education from a distance, that they only put the miles, you are proud of that boy who dreamed that the Calderon would sing his name.
A thousand feet above the ground I remember, now more than ever, all the teammates, coaches and club workers who made it possible that the child is now a man.
Winning a title there is a mix of smiles and tears. This is what happens to me now, tears because I am leaving, smiles for the illusion of something new, but also the assurance that someday I will return home. Thanks for everything."