Mousset struck the winner against Arsenal last week.
"Lys came on and he gives us that explosiveness up top," Stevens said. "And I thought he took his goal really well.
"He is going to be a real threat for us this season, they all are. We have got great strikers. Each and every single one of them play their part."
He also told The Star: "He has bed in to what we are about and he is working hard on it. And you can see that by his performances. He is on form now and he will only get better for us I think.
"He has got great English. He gets involved with the lads and loves being around us and I think he is really enjoying himself."
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