Rangnick praised the new Chelsea aid Haverts in an interview with German Sky Sports.
Rangnick said: "I have no doubt that Haverts will be successful. In two or three years, he will become a top player."
"It took him a few weeks to adapt to the new team and find his best form. I also tried to persuade him to join Leipzig, but he was completely focused on Leverkusen."
"I don't see his weakness. He is like a modern-day Cruyff. He can score and assist. He can play the 9th position and the 9 and a half. I don't think he is suitable for the wing. , But he can play very well in the middle. History will prove that this transfer was very successful."