Hazard made a blistering start of the season with seven goals in his first eight league appearances.
Injury has meant Hazard’s form has dipped and the Belgium international hasn’t scored in the Premier League since October 7.
But Hazard will be key for Chelsea when they face Man City at Stamford Bridge (17.30).
Hazard has had seven permanent/temporary managers in his time at Stamford Bridge and has had generally performed well under each of them.
The only season where Hazard failed to hit double figures in goals for Chelsea was 2015-16 when Mourinho was sacked by the club after a poor start to the season.
And his Belgian team-mate Kompany believes previous managers have not got the best out of Hazard like Sarri has.
“I think he was due an offensive manager,” Kompany said.
“I can’t remember him having that a lot in his career.
“Eventually a manager like this is what he needed, no matter where he was, to get the best out of him. The future is bright for him.”
Hazard has gone six league games without a goal and ex-Arsenal defender Martin Keown says Sarri must “push” Hazard out of his current slump.
“Hazard is without a goal in 11 games for club and country,” Keown told MailOnline.
“When such a brilliant player has a dip in form like this, it is up to the manager to push him.
“Maurizio Sarri needs to demand more from him and let him know in no uncertain terms that Chelsea are reliant on him.
“When Eden Hazard is on it, I do not believe there is a defender in world football who could live with him.
“Should Chelsea’s season peter out, it could be the last we see of Hazard in the Premier League.
“If he is going to go, let’s see if he can leave a dent in this Manchester City team first.”