The England international, wearing the no.18 shirt, played 67 minutes as a right winger against New England Revolution in the Reds' 4-1 victory on Wednesday night.
Ferguson remarked: "[Right wing] was his position with Aston Villa until last season when they started playing him in behind the strikers - Gabriel Agbonlahor or Darren Bent - in a more advanced role, like the way we use Wayne Rooney.
"His capabilities are such that he can play wide left, he can play in behind the strikers and he can play wide right. He showed tonight he's a fantastic crosser of the ball. I think he hit three fantastic crosses in the game, which maybe isn't something we're used to with the way we play. But if we do get used to it then there's goals there. I was very satisfied."