Ferguson has been promoted from the youth team in recent weeks.
"Heâ€™s been about the first team a lot and has been great," said Naismith. "Duncan is a massive figure at the club in terms of the fans.
"He brings a lot of passion and has worked well with me. Iâ€™ve enjoyed the small things he does.
"We do shooting drills with Duncan. He takes a lot of it and has been good to work with.
"The fans love him. Everybody talks about â€śBig Dunc this and Big Dunc thatâ€ť. The clubâ€™s most recent success came when he was in the team. The Evertonians still remember that."
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