Zaha has been linked with a move to Chinese Super League side Dalian Yifang earlier this week, with reports suggesting the forward would be offered £390,000 a week to make the move.
Hazard is the 10th Chelsea player to register 100 goals and joins Blues legends Roy Bentley, Jimmy Greaves, Bobby Tambling, Peter Osgood, Kerry Dixon, Didier Drogba and Frank Lampard in the elite class.
Hazard said he was "just focused on the pitch" after scoring twice in Chelsea's 2-1 win over Watford on Boxing Day, the 27-year-old having now scored four goals in his last four games.
His contract at Stamford Bridge expires in 18 months and he is eager to move to the Spanish capital, although he doesn't want to leave through the back door from a club that gave him everything.More news: Macron Slams U.S. Decision of Troop Pullout in Syria
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However, Sarri is still hoping that Fabregas will stay with the club.
At the Estadio Santiago Bernabeu, they would be delighted to welcome the attacker in the winter market that opens in three days, but the Blues don't want to lose him in the middle of the Premier League season. "I think [he will stay], because in this position we have only two players, Jorginho and Fabregas, and so for me, it would be a very big problem to be without Cesc", he continued.
"I don't know the final decision of Cesc and the club".
Asked if he agreed with Chelsea's policy, Sarri replied: "It depends on the single situation I think. I don't know if he prefers to play as a winger but if he is able to play like in the last match in the centre, for me it's not a problem to put him in the centre".
"It's a rule and so we have to respect that".