Aubameyang joins a growing list of star names to have turned their back on Dortmund, along with Gundogan - who made his move to the Premier League ahead of Euro 2016 in somewhat more low-key fashion.
Aubameyang is believed to have eagerly pursued an exit from the club, but that did not stop him from notching up 21 goals in all competitions for Dortmund, including six in his last seven competitive outings for his former side.
"Maybe it wasn't the best way but everyone knows that Auba is insane - and yes, I'm a insane boy!"
"At that time I was also criticised for my open change intentions at BVB. There was a bit of disappointment, even though I spent five wonderful years there".
According to France Football, the Gabon worldwide, who wanted to leave the Bundesliga side after four and a half years at the club, was hoping for the La Liga giants to come knocking, something that never happened.
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"I'm not going to sit here and say Arsenal will finish fourth, but I hope they do".
"The whole hiccup was certainly not conducive to the performance of the team", he told Sport Bild.
"As a player you get on with it, and if you read any negative things in the paper every day, then it's a burden".
"[The fans] have to be happy [to see us together], we will do our best of course, like we did in the past".
Is Gundogan a hypocrite for his criticisms?