Karim Benzema struck a hat-trick, with Mariano Diaz and Nacho also on the scoresheet.
Zidane said, “I will always back my players, and I'm sure we will have a really good season, no-one wants to concede three goals, we are going to work on it and resolve it.
"We scored five goals, there could have been more, and we won. That is a real positive.
“We played a 4-4-2 that was more of a 4-4-1-1 with the attacking midfielder given a bit more freedom. We have a few players out but the idea is to change things around, we need a fresh approach and that is what we're striving for."