Chelsea are prepared to sell for £20 million.
Hecking told Sky Sports News: "There are a lot of good strikers in England, and for sure Romelu Lukaku is one of them.
"We showed our interest, but the transfer window is open until the 31 August, so a lot of things will happen. A lot of rumours about Wolfsburg, and you'll be one of the first to know if we have our striker."
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