Roberto Martinez insists Everton would not sell Ross Barkley in January even if they received a world-record bid for the midfielder.

Barkley's superb winner against Swansea at the Liberty Stadium on Sunday has increased speculation that some of the top clubs will make a bid to sign the England midfielder in the January transfer window.

But the Everton boss, who has described the 20-year-old as "a diamond", is determined to keep his prize asset at Goodison Park.

Martinez told the Daily Mirror: "Even if we got a Gareth Bale size valuation we would never even consider it in January.

"Ross is an icon for us. He represents everything we are trying to do this season, so even if a stupid offer arrived in January it would never affect us.

"It is important for us as a football club to show we are making the right decisions.

"There is no question mark over Ross's future, he is in the best moment of his time and is everything we want a player to represent at Everton.

"There is not even a question mark against whether he is going to be here in February or not."