Having been eliminated from the Champions League at the hands of his former club, Hazard caused a stir by joking with ex-teammates after the game.
"That was wrong," Hazard admitted in an interview with Het Nieuwsblad.
"What [Edouard] Mendy and [Kurt] Zouma said wasn't even funny, but I played with Zouma and I know Mendy. It's always fun to see your friends again.
"I know that I damaged Real Madrid's image. Everyone assumed that I wasn't hurting, but that couldn't be further from the truth. I was very disappointed. If there was any game that I wanted to win then it was against my old club at Stamford Bridge."
The No.7 faced a backlash in Spain, particularly from some parts of the media, but he insists that his teammates were largely supportive of him.
"I got a few calls," Hazard said when asked if his teammates had anything to say to him afterwards.
"But, honestly, it's a very nice group and that's one of the reasons I want to stay. There's a good atmosphere.