The striker got his fifth goal in four games so far to see off the Premier League champions 1-0 at Anfield, helping Daniel Agger's header beyond David De Gea.
He did so in front of watching England manager Roy Hodgson and his form would surely put him in line to feature in the forthcoming World Cup qualifiers against Moldova and Ukraine.
Those chances increased when United boss David Moyes ruled Wayne Rooney out of the fixtures with a facial injury, but Sturridge gave Hodgson even more to worry about.
"It was great to have the manager here, it's important for me to be out on the field," Sturridge told Sky Sports 1 after sending Moyes to his first league defeat since replacing Sir Alex Ferguson.
"I had a problem with my thigh before the game, it's still hindering me now, but I went out and put on a good performance for the boys. Hopefully I'll be okay for the (England) squad."
Liverpool have now won all three of their Premier League games 1-0, and Sturridge added: "We have been working hard as a team since the start of the season. It's not about individuals.
"We came out to work for the fans and the club."
Liverpool's defensive work has been noticeable and they barely gave United a chance inside the box.
"Everybody is playing well, working hard and showing the right attitude," said man of the match Martin Skrtel."
Liverpool manager Brendan Rodgers was keen to stress that a better mental resolve has helped his side at the back.
"Our mentality was key. We didn't play as well as we have and Manchester United played some really good football, but our defensive mentality gets better all the time," he said.
"The resolve we have in the group was evident."
With Liverpool's extra-time cup win over Notts County taken into account, the Reds have won four from four this season.
"The players have been outstanding," Rodgers added.
"We worked hard in pre-season to get this start. We have four from four and we are getting the rewards for how hard we're working.
"I am so proud of them."
Rodgers' joy was certainly shared by the Liverpool owner, John W Henry.
"Terrific win; terrific start for the season. What a match! Poised and smart play against United. Team effort, superb desire," the American wrote on Twitter.
Despite their defeat, Moyes was pleased with how his Manchester United players performed, believing they were so good that the club will not be affected should they fail to land anyone on deadline day.
The Scot has tried to sign Leighton Baines and Marouane Fellaini from old club Everton with little joy so far, while Athletic Bilbao said during this game that Ander Herrera was not available.
"I thought we played really well," Moyes said.
"Liverpool were resolute and made it hard for us to score. We maybe didn't quite create the best with the crossing. We got two or three opportunities in the second half and were just a little bit unfortunate that we didn't take them."
The transfer window closes at 11pm on Monday and Moyes added: "We will try and do it, but from what I saw of the players, I'm more than happy with the players I've got. I thought they played really well, probably the best we've played this season."
On defender Phil Jones, who went off in the first half, Moyes said: "He went over on his ankle when he fell and we will assess how bad it is."