The Spanish youngster is on loan from Barcelona and Martinez is loving the impact he is having on the Toffees side who currently sit fifth in the Premier League.
Martinez reserved special praise for 19-year old Deulofeu who has netted two goals in his past three league outings.
"I'm surprised that he's doing it so quickly, that is the truth," he told Sky Sports News.
"He has adapted to the physicality of the league. I think it was important for us to bring some young blood into the squad and have a good blend with the senior players. I think that is really important.
"It allows the younger players to produce and Gerard has adapted so quickly. He has been working so hard to try and help the team and he brings something different. He has raw talent and we need that I still think the best of Gerard is still to come.
"He has strong belief in his own ability and we just want him to continue to deliver until the end of the season. Obviously the fans play a huge role in helping the player to settle and feel that they can express themselves on the football pitch."
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