Chelsea have lodged an improved offer for Jules Kounde.
But it is believed Thomas Tuchel's side are the frontrunners for Kounde's signature.
The Blues had an offer of £46m including add-ons for the French defender rejected by Sevilla.
Now the Premier League club have put forward an improved offer of £55m, per The Daily Mail.
Personal terms already in place and Kounde bid farewell to the club's supporters on Wednesday.
The 23-year-old hopes a deal can be agreed by Thursday.
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