Three years on, though, Hazard has said he would love to work with Mourinho again one day and revealed what he messaged him after his departure in December, 2015. "I was totally out of shape at the start of the season, I remembered that lesson this summer - four weeks after the World Cup I was back in training at Chelsea".
"Hazard is a phenomenal, fantastic player, but he wasn't getting those 20-25 goals per season".
"We didn't win, we got into a sort of routine, training-training without having fun, it was better for all parties that the collaboration came to an end".
Asked about wanting to win the Ballon d'Or and whether he needed to be in Spain to do so given Lionel Messi and Cristiano Ronaldo's 10-year duopoly of the award while at Barcelona and Real Madrid, Hazard smiled to reporters while on worldwide duty: "That's why I want to go, maybe".
Chelsea fans will be keen for Hazard to commit to the Stamford Bridge club, but Zenden feels that the Belgian could go to the next level if he joined a club like Madrid. I felt a little bit guilty because I'd been player of the year.
The Belgian forward is regarded as one of the best players in the Premier League and has been heavily linked with a move to European champions Real Madrid in recent months.
He leads this season's Premier League scoring charts with seven goals as Chelsea sit second behind champions Manchester City, on goal difference, in the standings.
Yet, offer Hazard the chance to work with Jose Mourinho again and he would jump at the opportunity.
However, it is Man United boss Mourinho who Hazard is hoping to be managed by in the future.
"Mourinho's image of an extremely defensive coach isn't completely right".
According to him, moving to Spain serves him the best opportunity to win the coveted award especially with his current fine form. "Then he is a friend of yours - you ask whatever you want".
Pogba had urged Mourinho to adopt a more attacking approach at Old Trafford.