The value of England's top young stars, like Barkley and Stones, will rocket according to Martinez
The Everton manager fired a warning shot ahead of the opening of the transfer window and also predicted the prices of English players will spiral to mind-boggling levels next summer.
Stones was the subject of numerous bids from beleaguered champions Chelsea in the summer with a final offer of about £37million rejected by Everton chairman, Bill Kenwright, who also ripped up a transfer request from the defender.
The likes of Manchester United,Manchester City and Barcelona are also interested in the England defender but Martinez has warned there will be no repeat of the saga that dragged throughout the close season.
"The same players will have more options so the value of the player will be increased just because of the bargaining," he said. "For example, if everyone has £10m to spend then instead of one offer in the summer you are going to have four offers. It will be the player who decides.
"100 per cent the prices will go up for English players again. The premium of having English players will be more expensive, the premium of having European players will be more expensive and scouting will be important for making better decisions on leagues that people do not usually look to.
"Scouting will be so important so that you don't go to the obvious targets. You need to be a bit more creative and look at other markets to avoid that bargaining."
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