Manchester United boss Ralf Rangnick concedes their performance wasn't good enough after victory at Norwich.
A 75th minute penalty scored by Cristiano Ronaldo won the game for United.
Rangnick said, "It was a very intense game, very physical. They played well, they didn't play like a bottom team. We had some problems in the first 15 minutes.
"From the start we controlled the game but didn't always have the best possible solutions. Defensively we did well, tactically in the first half we didn't allow them to have too many shots or chances.
"At half-time I told the boys we needed to increase the speed and intensity of the game. Th second half was a little bit better but at the end we were lucky to have a clean sheet and there were two or three clean sheets by David de Gea.
"It's another clean sheet but still a lot of work to do.
"The second half I was not at all happy with the amount of corners that we gave away, but we got the three points.
"We have conceded the highest amount of goals in the top ten. Now we have two clean sheets which is good but we still need to improve on that away, especially against physical teams or teams that attack high like Norwich did.
"It's also a question of body language and physicality and this was one of the major issues that we could have done better."
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