Arsenal forward Pierre-Emerick Aubameyang has blasted Borussia Dortmund CEO Hans-Joachim Watzke and labelled him a "clown."
Watzke said Aubameyang left Dortmund for Arsenal in January 2018 due to financial reasons.
The Dortmund CEO told Suddeutsche Zeitung: "Aubameyang, who plays great at Arsenal, will probably be warm-hearted when he looks at his bank account, but on Wednesdays will be saddened when he has to watch the Champions League on television."
Aubameyang responded on Wednesday and questioned Watzke for selling Ousmane Dembele to Barcelona in 2017.
Better for you I never talk about why I really left Dortmund Mr Watzke you such a clown 🤡 I remember that time you said we never gonna sell Ousmane then you saw more than 100M you were the first to take that money 🤣🤣🤙🏽don't talk about money please!!! Leave me alone pls 🙏🏽— Aubameyang P-E (@Aubameyang7) October 3, 2019
"Better for you I never talk about why I really left Dortmund Mr Watzke you such a clown," he said on Twitter.
"I remember that time you said we never gonna sell Ousmane then you saw more than 100M you were the first to take that money. Don't talk about money please!!! Leave me alone pls."
Speaking at a news conference on Friday, Dortmund sporting director Michael Zorc said: "Auba shouldn't have taken that tone and not used those words. Watzke did not say anything bad, he did not mean mischief.
"We always supported Auba throughout the four-and-a-half years he was here. Also in difficult situations. That's why I can't comprehend it. Especially since I know every background, every detail, I don't really know what he meant. Auba is no longer a Dortmund player and that's why I want to end all discussions here."
Dortmund initially rejected a bid from Barcelona in the region of €100 million for Dembele, but later accepted an initial fee worth €105m.
Aubameyang scored 141 goals during a five-year period at Dortmund and won the DFL Pokal Cup in 2017.
The Gabon international has enjoyed a fine start to the new season, having scored eight goals for Arsenal in competitions so far.
ESPN FC's Germany correspondent Stephan Uersfeld contributed to this report.