Bale is struggling with an injury, which Zidane admits is concerning.
He stated: "Bale won't feature tomorrow. We'll have to see what his injury is.
"We'll be monitoring his progress every day and we'll see if he's fit in time for Tuesday. I hope that he's back with us shortly. He has some swelling to his soleus, it's a muscular issue on the area he was operated on. I'm worried about it because I don't like to see players out injured and all the more so during the run-in.
"He was excited after having spent three months out, but he knows that it's not a serious one, it's just a setback."