The Canaries shocked Spurs 2-1 at White Hart Lane.
"We get hold of the ball more when we played 4-3-3, I think we control the ball more, but one or two didn't look quite right today. I thought we struggled a bit in certain areas," he said.
"Holt held the ball up, got his body in the way, right from the first whistle.
"We couldn't handle them. They worked their socks off, I thought they were ever so good.
"But we had some great chances - and Gareth Bale hit the bar.
"There were chances at both ends, though, it was too open, from our point of view, really."