Chelsea have been given a transfer warning in their pursuit of Kai Havertz, as Bayer Leverkusen sporting director Rudi Voller has insisted that the Blues must meet their terms to land his signature.
Goal reported last month that Chelsea have opened negotiations with Leverkusen over a potential €76 million (£69m/$90m) deal for Havertz, who was one of the standout players in the Bundesliga in 2019-20.
However, before the coronavirus-enforced break in the season, the Bundesliga side's head coach Peter Bosz insisted that a prized asset would not be sold for less than €100m (£90m/$111m, while talking up his rapid rise to prominence in Germany.