Lucas Barrios admits he's unhappy at Borussia Dortmund.

The Paraguay striker has been linked with Liverpool and Manchester City.

"Of course, I do not want to sit on the bench for a second season," Barrios told BILD.

"That is not what being a professional footballer is about. I'm unhappy, but I'm waiting for my chance as a professional.

"It is difficult on the other hand for me to accept this after such a successful season."