The midfielder is already having his best ever Premier League campaign in terms of finding the back of the net with 13 strikes already in the competition across 2018/19.
Sigurdsson told the Liverpool Echo: "I'm quite happy.
"I could have had a few more goals, but I think you always want more. I'm quite happy with the assist today [against Manchester United] as well.
"We knew it was going to be a tough game but we started really well and it was nice to get two goals in the first half, get a clean sheet and play some good football.
"Overall it was a very good day, with a clean sheet and three points."