Rahman, who is on loan from Chelsea, says Hazard's recent display again West Ham shows he is currently one of the best players in the world right now.
“We have a lot of memories together," he told Goal.
"Before the games, in the locker room, I sat next to him every time.
“In general, we talked about life, about games. He is such a good player, so strong, and very dangerous too.
"I think he's one of the best players in the world right now, and everyone sees it.
“Can he win the Ballon d'Or? With Eden everything is possible.
"I think it's just a matter of time for him to win it."
Hazard, who has been heavily linked with a move to Real Madrid, has scored 19 goals for the Blues this season.
Hazard has been heavily linked with a move to Real Madrid, the club where Cristiano Ronaldo won four of his five Ballon d'Ors.