Liverpool centre-back Jamie Carragher feels the side are returning to their defensive best but knows they will have to maintain that over the coming weeks if they want to sustain their challenge for Champions League qualification.
A resolute rearguard action in the 213th Merseyside derby, for which they played more than 55 minutes with 10 men after Sotirios Krygiakos' dismissal, earned a 1-0 victory thanks to Dirk Kuyt's 50th goal for the club.
A seven-match unbeaten Barclays Premier League run has now brought 17 points and six clean sheets, lifting Liverpool into the top four for the first time since early October. And Bootle-born Carragher, who played in his 25th meeting between the near-neighbours on Saturday, knows how important the victory was for morale.
"It is not just three points, it has a massive impact and everyone is buzzing," said the 32-year-old.
"For the last four or five years we have been good defensively under Rafa and we are just getting back to our normal selves. If you keep clean sheets you are going to win games.
"It is important we keep that feelgood factor after the Arsenal game and that will be by making sure we get a good result."