It came after a torrid four years at Real Madrid in which he continually picked up injuries.
Hazard played just 76 games across four seasons for the Spanish giants as his body regularly broke down.
Yet despite his fitness problems, it is understood he still received several lucrative offers from Saudi Arabia.
This was the reason some were surprised he opted to retire rather than cash in at the end of his career.
But Mikel, 36, who spent five seasons alongside Hazard at Stamford Bridge, has now explained the forward’s explanation for his decision.
Speaking on Rio Ferdinand’s Vibe With Five, he recalls Hazard telling him: “‘Should I go to Saudi Arabia, where I’m going to take a million a week, and then what? I got about two or three offers to go to Saudi Arabia.’
“He said, ‘Mikel, I’ve got a lot of money. You know how I live my life. I don’t spend too much money. So, I have money now to live with my family and to bring up [my children].”