Hazard hasn't been seen this season due to injury, though is in the squad for Real's second UCL group game.
Zidane said, "If he is with us it is because he is well and that is good news. I'm not surprised and we're all happy to see him.
"We will see tomorrow how we use him. The important thing is that he is with us again and that is a very positive thing."
Zidane was also asked for an update on Sergio Ramos' new contract talks.
But he would only add: "Tomorrow we have a game and we are all thinking about tomorrow's game."