Schmeichel admits Januzaj looks a special talent and applauded his bravery throughout the game.
"For David Moyes to play him and get that out of him was a bonus," Schmeichel told Sky Sports.
"It was a gamble, it was a chance. He has Valencia on the bench and could have played him. He had Welbeck on the bench and could have played him, but he chose to play him because something was missing.
"Something has been missing in the first six games, a little bit of inspiration and my God did we get that today from that young man.
"We've seen something special. All the way throughout the game he wanted the ball and was brave enough to take the ball, even when he was being marked very tightly.
"We saw a little bit of what we don't like as well. He got booked for diving in the penalty box, but a few players tonight should be worried about their positions.
"There's a few players that should be worried."
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