Martinez said: "To say that Gerard is a talented boy is an understatement. He's got incredible potential - that really raw talent that any fan wants to watch.
"We need to be a little bit patient because Gerard needs to adapt to a different way of playing, in a league with a different physicality, but that was always the plan; to give Gerard a steady introduction.
"Slowly you're going to see a player that's going to develop, grow and give us some incredible memories at Everton I'm sure."
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