The Everton took charge of Inverness Caley earlier this season.
Morrison said: Duncan is an absolute force of nature. You sit with him for five minutes and he stands up and shadow boxes. You would not need a wind farm if you could plug Duncan Ferguson in, because he has megawatts of energy. He's quite incredible.
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Nobody is more concerned and enthusiastic about getting us into, first of all safety, then into the (promotion) play-offs than Duncan. If we lose or don't play well, do not get in contact with him over the weekend. It's not a wise idea. He loves it here.
"He's absolutely a fighter, but he's a really lovely guy. I'm really impressed with him and with the guys he's brought in. He's done a cracking job."