Chelsea and Bayer Leverkusen are said to be £15million apart in their valuation of German sensation Kai Havertz. The Blues are looking to add the 21-year-old starlet to their rapidly improving squad this summer and are working hard to conclude a transfer.Frank Lampard 's side have already agreed a deal in principle to sign Timo Werner from RB Leipzig for £53m, while the transfer of Hakim Ziyech was agreed with Ajax in February.
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