Having already sold Mats Hummels to Bayern Munich last month, the Bundesliga outfit are in serious danger of losing their best players to Europe’s elite sides.
Worse still, Pierre-Emerick Aubameyang, Marco Reus and Henrikh Mkhitaryan have all been linked with moves away in recent weeks, especially so the latter.
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And it would seem that Dortmund - renowned for being a friendly and cooperative club - are particularly bitter about Gundogan’s departure.
That’s how their Facebook post to confirm the German’s move comes across as anyway.
Here’s what they said.
“Gundogan moves to Manchester City,” they began. “Bundesliga side Borussia Dortmund and Ilkay Gundogan will go their separate ways in [the] future.”
Now comes the juicy part.
“The midfielder, who is currently suffering from a knee injury, will leave the eight-time German champions in the summer to join Manchester City, who finished fourth in the English Premier League last season, on 1 July 2016.
“The two clubs reached an agreement and the details of the transfer will remain undisclosed.”
Was there really any need to include the fact Gundogan is injured and leaving Dortmund - "eight-time German champions" - for a side who narrowly claimed fourth last term?
Probably not, but they clearly felt a need to not only remind Gundogan of what he was leaving behind, but make a snide criticism of City’s poor season.
On a happier note, Dortmund’s sporting director, Michael Zorc, thanked the Germany international for his time at the club.
“We would like to thank Ilkay Gundogan for five extraordinary years in Dortmund,” he added. “BVB wishes him a speedy recovery and all the best for his future in Manchester.”
This all comes after the box-to-box midfielder tweeted about his move to the Etihad before the Citizens had even confirmed it on their own Twitter account.
Gundogan tweeted City saying: “@MCFC ANNOUNCE GUNDOGAN ;)”, to which the club replied: “Sounds like a plan @Guendogan8! Let’s do it #WelcomeIlkay”.
Only after that short exchange did the two-time Premier League champions make an official announcement, also tweeting a video of Gundogan proudly wearing the club’s training jumper.
The German did make a statement of his own, of course, saying: “Hi guys. After five successful years, my time in Dortmund is over. We celebrated many victories and stood together in moments of defeats.
“Special thanks to my BVB coaches Jurgen Klopp and Thomas Tuchel. I had a great time with them and advanced to a player of the German national team.
“Good luck to BVB for the future. I will give my best to get fit again as soon as possible."
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