Michael Carrick says Manchester United cannot afford to fail to build on their 1-0 win over Real Sociedad last night, according to BT Sport.
The Red Devils play a second of three consecutive home games on Saturday when they host Stoke City, and the ever-present central midfielder highlighted the importance of continuing to win.
"The frustrating thing is we have had moments in certain games of when you think 'this is it, we're on the up'," said Carrick.
"Then in the next game for some reason it doesn't go how you would expect. That is the challenge we face. We have done well enough again, but then we have to on Saturday."
The England anchorman suggested that there were only "little details" separating United from accumulating more points than the disappointing 11 they have managed so far this season.
"You can look at the Southampton game last Saturday and say we really should have won. We were 1-0 up and had chances to score more. Then we concede from a corner," he continued.
"In that instance, you could say we can defend corners better but overall it is about fine margins and little details. In the past we have been good at getting on top of those things and seeing games out."
Despite the improved nature of the performance against Basque side Sociedad in the Champions League, United - without last season's top scorer Robin van Persie due to injury - came under scrutiny for their profligacy in front of goal.
Nevertheless, Carrick was optimistic about the situation, pointing out that it is promising that the team are creating so many chances at the very least.
He added: "The attacking lads are looking dangerous, it is just not falling for them at certain times. You are more concerned when you are not creating chances and the lads aren't getting opportunities.
"With the quality we have I am sure they will soon start going in a lot more."
This season is Carrick's eighth with Manchester United, and the 31-year-old won the Players' Player of the Year award last season as well as being rewarded for his outstanding performances with a place in the PFA Team of the Year.
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