Chelsea assistant coach Gianfranco Zola feels Eden Hazard is in career best form.

Zola, who scored 80 goals in 312 Chelsea appearances between 1996 and 2003, needed no time to put Hazard top of the Stamford Bridge pile for overseas recruits.

"Eden Hazard's definitely at the very top," said Zola, ranking the 28-year-old as Chelsea's best-ever overseas signing.

"He's such an unbelievable player. The more I've spent time with him the more I appreciate him as a player, but also as a boy.

"He's been great. I would love to have him for longer. What we are trying to do here perfectly suits him. It's no coincidence that he's having his best season.

"I don't want to take anything away from him and what he has achieved. But certainly the way we play helps him a lot."