The reports that link Eden Hazard to Real Madrid will just never go away, and why should they; Hazard has been in incredible form since the start of this season already notching up eight goals and three assists in all competitions.
And Calderon has slammed the Blues saying that they should allow the 27-year-old his dream move to Madrid.
Gazetta dello Sport have suggested Hazard would be happy to accept a new contract worth £15.8m a year after tax which would see him snub Real.
"He's a fantastic player", Italian boss Sarri said.
"It will be very important for us if he will remain with us, it will be very important".
Mourinho managed Hazard at Chelsea during the Portuguese's second spell at the club, with the playmaker instrumental in the Blues' 2014-15 Premier League title triumph.
Winger Eden Hazard has reportedly indicated that he is happy to sign a new £300,000 per week contract in order to remain at Chelsea.
"I am not able to think about the market at the moment", he added.
"Leaving or staying, I knew I was going to be happy".
Hazard made several comments about a transfer switch to Spain during the worldwide break, but also insisted he would not force his way out of the club.
"There's no point to having a player who wants to go; slavery was abolished a long time ago".