Kai Havertz has no "COVID discount" and Chelsea must meet Bayer Leverkusen's valuation or miss out on a deal, Rudi Voller has warned.
Germany international Havertz is reportedly keen on a switch to the Blues, who have long been linked with a move for the 21-year-old.
Havertz is said to be in favour of a move to Stamford Bridge but the two clubs still seemingly have work to do to strike a deal.
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Leverkusen are claimed to want £90 million ($115m) for Havertz, with Chelsea thought to be interested in a structured deal that starts at around £70m.