Speaking at a press conference to confirm his return to the club, Zidane admitted he had found it hard during his time away.
Zidane said: “It has been difficult from the outside looking in. I am looking forward to working with the players again, to competing again.
“I have been living here in Madrid, doing my things. But I have recharged my batteries. I’m ready to coach this great club again.”
Zidane dismissed suggestions that he had made the wrong decision when he decided to leave in the summer.
He insisted: “When I left, it was the best decision for everyone.
“The team and the squad needed a change. There is nothing more. I told you what I thought at the time. Nine months passed and the club called me again.”