Crerand, who played 397 times for United and was part of the iconic 1968 European Cup-winning team, is convinced Varane will make a big impact.
He told manutd.com: "He's a class act.
"He played in the 2018 World Cup for France and stood out. He's a totally class act.
"I don't think there are many top central defenders anywhere. He reminds of Rio Ferdinand actually - that's how good he is.
"He's excellent with the ball at his feet and he makes everything look easy, exactly the same as Rio. That's because they're terrific players. They make things look easy. They can read the game well."
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