Jules Kounde has been left out of Sevilla's pre-season training camp in Portugal as Chelsea continue talks to sign the defender.
Chelsea have had a verbal agreement with Kounde since June. He has been admired by Tuchel for some time, having been linked with the Blues in last summer's transfer window.
Chelsea have signed Raheem Sterling and Kalidou Koulibaly this summer but Tuchel is keen to add another centre-back to his squad having lost Antonio Rudiger and Andreas Christensen to Real Madrid and Barcelona.
Chelsea were interested in Matthijs de Ligt, who has joined Bayern Munich for £68m, and Nathan Ake, who appears likely to stay at Man City.
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