Gnabry joined Arsenal's U-18 side from Stuttgart back in 2011, but failed to become a first team regular at the Emirates Stadium and joined Werder Bremen this summer.
Since joining Werder Bremen, Gnabry has caught the eye with a number of impressive performances, scoring four goals in nine games for the Bundesliga side.
The 21-year-old's form led to him being called up to Germany's senior side, where he enjoyed a dream debut, scoring a hat-trick on his first outing for Die Mannschaft.
Despite failing to live up to his promise with Arsenal, Gnabry was very grateful for his experience in England.
"I would not have been the player I am, not without my time in England," Gnabry told 'RND'.
"There is Arsenal's playing style, for example, that I had to learn during my time there.
"And it is a given that you learn a lot and improve when you are training with great players like at Arsenal for three years. That was definitely the case with me.
"I would perhaps not have been with the national team now without my time in England".