He's never particularly stood out to me in the youth teams, but I thought he looked surprisingly adept. He seemed generally up to speed with his team-mates and seemed to cover the ground well.
He looked a bit more ready to me than Lacey, whose current lack of physicality seemed a bit more evident and who appeared a bit slow to react to a couple of balls.
That didn't look like a potential issue based on yesterday - he seemed quite quick and covered ground well. It was always more of the potential draw-back with Mainoo, even based on his academy appearances. Fletcher already looked less sluggish than Mainoo does.