Ronaldo drew another blank in victory at Alaves on Saturday.
But Zidane says: "Cristiano performed as he always does. Whenever he doesn't score, you always ask about him, but he's fine. He's keen to score, as is to be expected, but it's a long old season and, as always, he'll end up being the difference-maker.
"I like the position that he's operating in. We're able to set up in several different ways. Today he played up top alone, but the ball just didn't want to go in for him. He's capable of playing in many positions."