And United appear willing to meet that price, having already spent £75m on new arrivals this summer.
Their interest stems from the collapse of Otamendi's transfer yesterday, after City swooped in with a £31m bid for the ace.
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John Stones is wanted by both Manchester United and Chelsea
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Two-time Premier League champions City will pay around £8m for 27-year-old Otamendi because Valencia already owe the club back for Alvaro Negredo's transfer this summer.