Manchester United captain Harry Maguire admits they were fortunate for victory at Norwich City.
A 75th minute penalty scored by Cristiano Ronaldo won the game for United.
Maguire said: "We know the performance wasn't at a level we want it to be. We need to work on that, recover and go again on Tuesday.
"When you come away from home, it's always tough. The Premier League is so competitive. Tonight we didn't play at the intensity we showed against Crystal Palace, we need to work out why.
"But we got the clean sheet and the result we wanted.
"When a new manager comes in everyone's trying to impress. Every player in the dressing room wants to be starting for this club."
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