Watford boss Mackay: Arsenal's Lansbury will be top player
Speaking after the 2-1 defeat, Mackay said: "I think he showed tonight his awareness, his touch and his delivery, his legs and his all-round awareness and he is going to be a top player.
"He came on and he wanted the ball and wanted to be involved. But he was also involved in some of the muckier things as well. He was closing down, putting the challenges in, putting his head where it hurt and I was delighted to see he looks like a winner."