“We already had a gentlemen’s agreement with Jadon last year that he can switch under certain conditions,” Zorc told ARD.
“He’s been with us for a couple of years. However, this agreement does not exist with Erling.”
Haaland has a release clause in his contract of around £65m which does not become active until 2022.
But despite Dortmund’s stance that the Norwegian is not for sale, his agent Mino Raiola insists that could change before the end of the summer window.
“What we know as of today is that Dortmund spoke extremely solemnly to us and said: ‘We are not selling him’. That’s the situation, definitely,” Raiola told Spanish outlet AS.