It's also because Zidane took initiative quicker than Sir Alex. Varane was promised to be working under his childhood hero: Zidane. Which he did. And Jose wasn't shy in telling him his plans of using him alongside Ramos either. He also wasn't afraid of dropping Pepe for Varane, something Ancelotti isn't afraid of doing either. Varane is happy at Madrid.
we almost signed Varane before Real Madrid did but guess what, we brought Jones instead. Well we didn't really buy jones over Varane but at that time we recently brought jones so we couldn't buy Varane.
According to reports, Jose Mourinho says that Varane had one foot at Manchester United before signing for Real Madrid.
The reason he went to Real Madrid was because Jose promised him first team action and also when Real Madrid wants you, why wouldn't you go