The 25-year-old has been an ever reliable performer for the Serie A side, which has caused United to sit up and taken notice.
According to Italian football site Tutto Mercato Web, Juventus could rival United for his signature.
Rio Ferdinand signed a one-year contract extension yesterday
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It is understood Antonio Conte is a long-term admirer of Ranocchia and is planning a £12.8m bid for him in the summer.
Ranocchia has been coy about his own future. "Future? I never thought to go away, I came to the team mid-bass and even last year I played a little hurt and I always thought to stay and finish my career here," he told the Italian press.
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