Kalidou Koulibaly's €40 million transfer to Chelsea from Napoli is almost complete.
After losing Antonio Rudiger and Andreas Christensen, the Blues are eager to bolster Thomas Tuchel's defence.
The Premier League team and Koulibaly are reportedly close to reaching financial and personal agreements, according to The Athletic.
According to reports, negotiations are moving rapidly and Chelsea is optimistic about closing a deal.
Before the start of the new season, Tuchel is eager to add at least two new defenders.
In addition, Chelsea is interested in Matthijs de Ligt from Juventus and is in negotiations to get Nathan Ake from Manchester City.