Jules Kounde has agreed on personal terms with the Blues.
The Blues have been linked with a number of potential signings this summer as Tuchel looks to strengthen his defensive options.
They have brought in goalkeeper Marcus Bettinelli on a free transfer so far.
Sevilla’s Jules Kounde who played 34 La Liga games last season has been heavily linked with Tuchel’s side.
According to Ian McGarry, Chelsea have agreed on personal terms with the 22-year old defender but the transfer fee is blocking his move to the Stamford Bridge.
McGarry said on The Transfer Window Podcast: “Jules Kounde, the France international, has a buyout clause of around €75m.
“Chelsea have agreed personal terms with the player but they haven’t yet met that asking price to Sevilla with regards to buying the player out of his contract.
“The general word around Stamford Bridge is that if they need to do it, they will do that.
“Tuchel is certainly not entirely satisfied with his roster of defenders. He has already been offering [Kurt] Zouma and [Andreas] Christensen to other clubs with regards to potential moves, part exchanges, swap deals etc.
“It’s another big smoke signal this is going to happen.”