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John Stones will not be leaving Everton in January, manager Roberto Martinez has said.
Chelsea made several attempts to sign Stones during the summer but Everton held firm and rejected a £37million offer from Jose Mourinho's side.
The Blues could reignite their interest in the defender in January as they look to turn their season around but Martinez has made it clear the centre-back is not for sale.
"It doesn't matter if Chelsea come back in for him. We created a squad to see how far we could go over 10 months. January doesn't come into consideration," Mourinho said.
"We'll never lose anyone in January - unless it's somebody who hasn't been playing and we need to find a solution. If he's a top performer, it's not even a consideration."
Chelsea have lost nine times in the Premier League this season and with the reigning champions looking to solve their defensive problems there is a chance they could look to sign Stones. Martinez, however, feels they will be wasting their time.
"When you are right in the middle of a season, I think players understand that you can't sell someone if you can't replace him," Martinez added.
"I think the uncertainty comes in the summer, where everyone speaks about possibilities.
"January is a window to solve problems with players who are not featuring as often as they feel they should, or to bring in players from a lower league to give them an opportunity."