Everton boss Martinez isn't worried by Chelsea's interest in Stones
Everton boss Roberto Martinez insists he is not concerned about the speculation surrounding John Stones as work continues on strengthening the Toffees squad for the new season.
There has been talk of Chelsea preparing a third bid for England defender Stones after so far having £20m and £26m offers rejected and Martinez admits the 21-year-old has been affected.
But the Spaniard has suggested the interest can be viewed as a positive thing.
"It is something where you hope you learn from it and you get more mature," he said.
"Clearly John is one of the outstanding young talents in the squad and you are going to get that sort of interest."
When asked about the prospect of Chelsea coming back with an improved offer, Martinez said: "You shouldn't worry about situations you cannot control.
"When you are not trying to sell, the focus is to try to be as good as we can. Everything else is stuff that does not bother me now at all."
James McCarthy, meanwhile, has signed a new five-year contract at Goodison Park.
The 24-year-old, who has attracted interest from Spurs and Man City, said: "I'm buzzing and delighted to be committing my future to Everton."