Chelsea have been linked widely with Everton defender John Stones in the recent weeks.

The Blues also have seen a first bid of £20 million being rejected by the Merseyside club for the 21 year old defender.

Roberto Martinez also criticised Chelsea for their public pursuit over his young asset and insisted that Everton are not a selling club.

Recent reports suggested that, Jose Mourinho could be on the verge of making an improved offer for the Everton wonderkid which would command a record British transfer fee for a defender overtaking Eliaquim Mangala’s transfer fee of £32 million which Manchester City paid for the French international.

John Stones is one the hottest prospects in world football and the 16th most valuable young player in Europe according to Soccerex study.

John Stones has 4 senior caps for the Three Lions and is dubbed to be the next “John Terry” and Mourinho wants the youngster to fill in the boots of captain John Terry in future.

On being asked about his interest on John Stones and abut the rumour of a improved bid, Mourinho said, “That is the market now,”

“You only pay it if you want to. If you don’t want to pay it, don’t pay. It’s as simple as that.

“The market has no rules or limits from season to season.”

After the summer departures of Sylvain Distin and Antolin Alcaraz, Everton’s defensive numbers are already on the light side and Martinez has insisted he is not interested in selling any of his stars.

But Mourinho, who has risked further upsetting the Merseysiders with a “smaller club” comment, is determined to test that resolve.

“It’s a good market. That’s why smaller clubs, if they have interesting young English players, they use that in the right way for them,” he said.

“I don’t criticise them. They play the market for themselves. If the big clubs don’t want to go over certain limits, they have to make a decision.”

The Everton youngster has three-and-a-half years remaining on his current deal after he moved to Everton from Barnsley in a £3m deal in 2013.