Varane had offers from both giants when deciding to leave Lens.
He told Le Journal du Dimanche: "Zidane called me and I asked him to call me back because I was studying for my baccalaureate. It's my relaxed nature that made me react like that.
"You have to be care-free to deal with so many things at such a young age.
"But to be honest, after that call, my mind was elsewhere; it was hard to focus on revising!
"It was the craziest period of my life: I was getting ready for the baccalaureate, the phone was ringing off the hook, I visited the Real facilities, I met Alex Ferguson.
"Just imagine, I was doing exams and signing autographs for other students. It was surreal. I'm really proud of having passed."
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