The Italian is set to leave Stamford Bridge to take over at the Serie A champions.
Sarri was successful in his first season at Chelsea, finishing in the top four and winning the Europa League.
But the former Napoli boss was an unpopular figure among many Blues supporters because of his style of play.
And Sky Sports in Italy now claim Chelsea have reached an agreement with Juventus for Sarri to take charge.
Derby manager and Blues legend Frank Lampard is the favourite to succeed Sarri at Stamford Bridge.
Chelsea are currently banned from making transfer for the next two windows.
And Lampard is seen as a figure who would bring stability to the club and would immediately have the backing of fans.
If the Derby boss is appointed his first Premier League match would be a showdown with Manchester United after fixtures were announced on Thursday.