The man Chelsea have lined up to add to their young, exciting squad remains with Leverkusen in Germany, as Bayer prepare for their Europa League quarter-final with Inter Milan on Monday.
The Blues want to make Havertz their next acquisition after signing Timo Werner and Hakim Ziyech, and are hoping to complete a £70m deal after Bayer finish their Europa League campaign, but Voller insists any deal will be on the German club's own terms.
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"With his talent, it means he's on the list of all the best clubs," Voller told Gazzetta dello Sport. "We know of the interest of a couple of clubs, especially Chelsea, but for us, the situation is quite simple: he has a two-year contract, if anyone wants him on our terms, fine, otherwise he stays here another year and we are happy.
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I think the deal is basically done. Meaning Havertz and Chelsea having everything sorted out, with clubs needing to agree on a transfer-fee. Right now everything is on hold due to Bayer playing in Europa League. When they lose to Inter, the deal will go through very fast.