The highly-rated 21-year-old has been linked with a move to Manchester United.
“Selling Neven Subotic is a non-issue,” Joachim Watzke told Bild.
“If Manchester United is wanting to have him, they would need to sign over a property of two oil-fields to us.
“Or at least two big trucks full of packaged pound notes.
“We have no intention to sell the player, he is under contract.”