John Stones will demand a £38million release clause as part of any new deal with Everton when talks eventually get underway, reports The Mail.
The stipulation would effectively allow Chelsea to complete a transfer deal as soon as the transfer window reopens on January 1.
Jose Mourinho's ever-so public pursuit of the 21-year-old in the summer transfer window saw four sizeable bids make their way from Stamford Bridge to Goodison Park.
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Chelsea never bothered putting in an offer of that size, however. Once Stones' transfer request was rejected, officials at the west London club believed they had done all they could to sign him.
Everton were praised for their stance and now want to reaffirm their position of strength by tying Stones down to a long-term contract.
However, Stones is unlikely to sign a new deal unless Everton agree to let him leave if Chelsea offer £38m.
Whether the clause would be active exclusively for Chelsea or for any interested club is not made clear, meaning Manchester United and City, who have also been credited with an interest, could benefit.
Reports last month suggested that Louis van Gaal and Manuel Pellegrini were ready to enter the race for Stones if and when Chelsea agreed a transfer fee.
With a £38m price tag placed on his head, it is more likely that the Blues would face competition from their Premier League rivals.