John Stones: Roberto Martinez not aware of transfer request

John Stones signed for Everton from Barnsley in 2013

Everton manager Roberto Martinez says he is not aware of any transfer request made by defender John Stones.

It comes after reports in the Sun that the 21-year-old is considering going public over a desire to join Chelsea.

Martinez insists Stones is not for sale and when asked if he knew of a transfer request said: "Not at all, no."

Everton have rejected bids of £20m and £26m while refusing to comment on a third offer. Martinez confirmed Stones will face Manchester City on Sunday.

He added: "[Stones] has been the hot topic of this transfer window. My only concern is preparing for the game."

Chelsea manager Jose Mourinho is believed to want England international Stones as a replacement for captain John Terry, 34, who was substituted during the 3-0 defeat at Manchester City last Sunday.