The Blues have had two bids of £20m and £26m rejected by the Toffees but Martinez is determined to hold on to the 21-year-old, who they value at around £34m.
"Clearly he is a player that we admire, clearly that is going to be the same in other clubs," he said.
"They are going to be admiring his ability and what he is as a footballer but he is an Everton player and as you can imagine he is a big part of what we are trying to achieve in the future."
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