The Belgian has received criticism for his conditioning since joining Real Madrid this summer.
"Hazard has an incredible talent," Mikel told beIN Sports in Turkey.
"Maybe not as good as [Lionel] Messi, but he can do whatever he wants with the ball at his feet.
"He didn't like to train hard. While we were working he was waiting for us to finish training just standing there. But on Sundays he was always man of the match, it was unbelievable."