Beating Manchester City could be "massive" for Liverpool's season after three games without a win, according to Trent Alexander-Arnold.
Having won their first seven matches of 2018-19 in all competitions, Jurgen Klopp's side have come unstuck in the past week, albeit in some difficult fixtures.
The Reds were beaten 2-1 at home by Chelsea in the EFL Cup before drawing 1-1 at Stamford Bridge in a Premier League meeting last Saturday, and their worst performance of the season followed on Wednesday as they lost 1-0 to Napoli in the Champions League without recording a shot on target.
Liverpool ended City's unbeaten run in the top flight in January, when they won a thrilling game 4-3 at Anfield, and they also knocked Pep Guardiola's side out of the Champions League quarter-finals with a 5-1 aggregate triumph.
And Alexander-Arnold hopes for another positive result on Merseyside to keep their title challenge on track.
"It's a massive game," the full-back told Liverpool's official website. "You've got to beat the best if you want to be the best.
6 October 2018
"One of the toughest tests you'll get all season is Man City, so taking three points from them for yourself can be big going forward. It would put a lot of confidence in us. That's our aim and we know we can do it, it's about doing it on the day.
"It's obviously going to be a tough game, but we've shown in recent games that we have the ability to beat them, to go toe-to-toe with them, and that's what we'll be looking to do again on Sunday – to go at them and try to win the game.
"We're not just taking part, we're not just looking for a point, we're looking to win and get all the points, but you're not going to get much harder opponents than Manchester City."
Alexander-Arnold believes the midweek disappointment at the San Paolo could help Liverpool to improve, provided they learn from their disappointing showing.
"I think the best teams bounce back from a defeat and that's what we'll be looking to do," he said. "It's important to keep the momentum going. There was a bump in the road on Wednesday, but we've got to keep trying to push forward and gather as many points as we can.
"It was a tough one and it was hard to take, but they're the type of lessons you learn from the most. You learn from them more than maybe coming away with a draw. I think maybe it can help us in the long run if we learn from it."