Erling Haaland said to make the main transfer, because the target of Chelsea gets a warning from Ousmane Dembele

Borussia Dortmund director Matthias Sammer has urged star striker Erling Halland to stay at the German club despite growing speculation that he could leave the summer.

Haaland, who has 49 goals in 49 games for Dortmund since joining RB Salzburg last January, is one of the most interesting prospects in the game against Chelsea, Real Madrid and Manchester United, all related to him.

The 20-year-old has a contract with the Bundesliga until 2024, but there is a dismissal clause that can be activated next summer.

Sammer says Halandana should not be tempted for speculation, but insists Dortmund is the perfect place for him to develop his game.

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“I would recommend that 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 few clubs.

“When Erling takes the next step, he has to be a finished product, perfect. He’s very, very good. He has to improve some details.”

Sammer also identified two examples of players who have left Dortmund in recent years and achieved varying degrees of success.

Robert Lewandowski, who joined Bundlesliga rival Bayern Munich in 2014, continues to go from strength to strength and is considered one of the best strikers in the world.

However, Ousmane Dembélé, who signed for FC Barcelona Dortmund in 2017, struggled to make an impact on the Spanish club.

Sammer says players must be ready before they can take the next steps, otherwise their talent goes to waste.

“Robert (Lewandowski) was complete when he went to Bayern,” he said. “It was clear: he went straight into the starting 11.

“But as a counter-example, Ousmane Dembélé may have gone to Barcelona a moment too soon.

“Erling is far in his development, but not complete.”