Arne Slot admitted his Liverpool side need to work on how to defend set pieces better as their perfect start to the season ended with a 2-1 defeat to Crystal Palace. The Dutchman told BBC Sport: “If you want to compete you need a very positive balance with set pieces and even more in this league. “It was one of our biggest strengths last season, now we have conceded two against Newcastle and two here. “Second half it was the opposite. But from a second set piece they won the game.