orussia Dortmund advisor Matthais Sammer says Erling Haaland should stay where he is.
The Norway striker is being linked with Chelsea, Real Madrid and Manchester United ahead of the summer market.
“I would recommend Erling also see the value of Borussia Dortmund,” Sammer told BILD.
“The club has given him a lot. From here he can only go to a handful of clubs.
“When Erling takes the next step, he must be a finished product, perfect. He is very, very good. He needs to improve some details.
“Robert (Lewandowski) was complete when he left for Bayern. It was clear: he went straight into the starting eleven. But as a counter-example, Ousmane Dembélé left for Barcelona perhaps a moment too soon. Erling is far in his development, but he is not complete.”