Chelsea are in contract talks with Bayer Leverkusen star Kai Havertz but the Blues are yet to have agreed a fee with the Bundesliga club.
Peter Bosz' men missed out on qualification for the Champions League, accelerating the Germany international's desire to leave in the near future.
Leverkusen were open to selling the 21-year-old but publicly stated that they wanted upwards of €100 million (£90m/$111m) for their prized asset.
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Chelsea are keen to negotiate a lower fee of around €76m (£70m/$87m) and it remains unclear when discussions will reach a conclusion.