Everton face Chelsea this Saturday and the bookmaker has priced Stones at 2/1 to swap shirts at full time.
Stones was linked with a summer move to Stamford Bridge.
Jose Mourinho's side had four bids for the England defender rejected, with the last one at a staggering £38million.
Everton rejected Stones' transfer request ahead of the last bid and Roberto Martinez believes the interest has made him even better.
Martinez said: “He has been performing on a very, very good level.
“John has gone from strength to strength in a period of high pressure. He has taken the support of everyone and you have seen him perform for England in a very natural manner.
GETTY
John Stones has been backed to be in Chelsea's colours
“That is a sign of the calibre of the player.
“Our interest is to look after every player who represents this phenomenal football club. We are going to look after the human being as well as the footballer.
“We will carry on developing John to allow him to be an important player for us.”
Everton V Chelsea - Premier League Preview
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