Goodison Park bosses have so far rejected three bids for Stones, with Chelsea hearing their latest £30m offer is around £10m short of Everton's valuation.
John Stones - Spotlight on
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Manchester United are thought to be considering a shock offer to hijack Chelsea's pursuit - much in the same way the Blues elbowed out United to agree terms with Barcelona ace Pedro.
Everton insist they do not need to sell Stones but will reportedly bring in Mori whether the England international departs or not.