Borussia Dortmund great Jurgen Kohler insists Erling Haaland cannot be considered world class.
Haaland is being linked with a €175m move to Chelsea this summer.
And Kohler told Ruhr Nachrichten: "He is not a world class player yet. He is a top striker and has the skills needed, but he still has something to prove.
"Haaland lacks the skills to create something out of nothing. What he has achieved as a 21-year-old is incredible. He has come a long way already.
"I'm sure he can develop skills that make him unstoppable. When he gets more experience, he will become world class."
