Pierre-Emerick Aubameyang was “mentally crushed” by his inability to leave Borussia Dortmund.
Aubameyang has been courted by a number of Europe’s leading clubs, including AC Milan and a host of English sides.
Interest has also been reported from the Chinese Super League, but the striker remains in Germany after failing to secure a departure.
Dortmund president Reinhard Rauball says the striker was “mentally crushed” by the situation.
“For many years now, he has put in great performances for the club and also became the league’s top scorer,” Rauball told Kicker.
“Auba is pleasant, has humour, he smiles. If you know the numbers, you need to understand that, at one point, he was mentally crushed by the offers.
“That he’s not earning those sums today is not because we blocked his move, but it’s down to the behaviour of clubs, and sometimes also the associations, who played a role in it.
“Aubameyang, to me, is a player who has played an influential role in our rise. He’s one of the cornerstones of our success.”
Rauball had slightly less generous words to say about Ousmane Dembele, who joined Barcelona in the summer.
“I liked Dembele and I really regret that he is not at our club anymore,” he said.
“Dembele has something sly. He has another mentality to which we are not used to.”