United lost their first game of the David Moyes era 1-0 at Anfield.
"From every game you can take positives and negatives, even from this one," he told MUTV. "In the first game against Swansea, we scored four. But I do not judge matches on goals. I think both games against Liverpool and Chelsea were both really solid, we didn't give our opponents anything.
"Not scoring is not like us but it is still the beginning of the season and we have so many games to play, some tough games. I would not say we are worried but we have to improve some areas."
For the big stories and the banter follow us on Twitter: @tribalfootball