Borussia Dortmund have warned Manchester United off defender Neven Subotic.

Dortmund are keen to keep hold of the 21-year-old and club executive director Hans-Joachim Watzke insist they have no plans to sell him.

"Selling Neven Subotic is a non-issue," he 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."

Subotic claims he is not thinking about a move away from Dortmund, insisting he is happy at the club.

"It is no secret I am enjoying being a player of Borussia Dortmund," said Subotic. "I feel good being a part of the squad and have the big ambition to be successful with the club in Europe, too.

"Therefore I am actually not thinking about a transfer away from Borussia Dortmund."