Dortmund are reluctant to let their star forward go, and are set to ask for at least £130m as a jumping-off point for negotiations.
If numerous clubs get involved and start a bidding war, that fee could continue to rise.
Dortmund CEO Hans-Joachim Watzke recently conceded that the club has no plan for Haaland’s potential departure, and that everyone at the Signal Iduna Park wants him to stay.
He said: “We do not have a parallel plan. We will discuss this with Erling, his father and his agent Mino Raiola.
“We also want him to be happy to stay with us, to score goals for BVB next year with conviction. There is no alternative plan.”