The 27-year-old has been allowed a free rein to express himself on the pitch and this looks to be working for the former Napoli boss.
"I had my doubts at the start of the season but since (Maurizio) Sarri has come here, there seems to be a fantastic feeling around the place", Harris said on Love Sport Radio. "It will be important for us if he remains with us", Sarri said in his pre-match press conference ahead of the visit of Manchester United. "I don't think he is".
"But I don't think Chelsea will sell him to Man United so it's not a problem because Chelsea is led by intelligent and experienced people in football. I only saw him yesterday, but I want to tell him (that) very soon".
Hazard has, time and again, stated his desire to play for Real Madrid.
The Belgium worldwide, who has a contract with Chelsea until 2020, has also stated his desire to play for Spanish giants Real Madrid.
Contrary to recent rumours, Tiemoue Bakayoko is not intending to return to Chelsea in January, says Calciomercato.com.
"You can see this season [Chelsea] have a lot of possession obviously, they are winning, they have one character you cannot miss in Eden Hazard, they say he is on fire, this time he is probably the best player in the PL right now".