Thiago Silva is due to undergo a Chelsea medical on Thursday - despite last-ditch efforts by Paris Saint-Germain to offer him a new deal.
The finishing touches to an offer have been agreed between Chelsea and the 35-year old Brazilian in the past 48 hours.
PSG manager Thomas Tuchel remains a huge advocate of Silva - and has continued this week to try to keep the former AC Milan defender in Ligue 1 for a ninth season.
However Silva's fellow Brazilian, PSG's sporting director Leonardo, does not share Tuchel's plan and wants Silva to leave.
One source is Brazil has told Sky Sports News relations between Silva and Leonardo had deteriorated, prompting Silva to want a fresh challenge at Stamford Bridge in the Premier League.