The final period of the game saw more changes, heavily disrupting the flow of the game as is expected in these pre-season games.
Liverpool are undefeated so far in pre-season, beating both Manchester clubs during the International Champions Cup in the US, and have spent approaching £200m on new signings as they look to close the gap on last season's Premier League champions Manchester City.
In truth, Alisson had little to do - but he was solid when he was called into action. Even after a few minutes of this friendly, that was clear.
Napoli were made to pay for their risky passing across the back as Liverpool pressed them as high as they could just four minutes in. They will then start playing for real on August 12, with the Premier League regular season opener at home against West Ham United. The fee for Alisson was necessary and it's up to him now to justify it. "The signs are really good for us to go the next step".
Some Liverpool fans on Twitter are already loving Naby Keita.
Their pressing, particularly in the first half, was excellent and ensured they were a threat in every passage of play.
Summer signing Fabinho came off the bench to replace the former England global.
Liverpool continue their pre-season preparations when they take on Napoli in a friendly at the Aviva Stadium in Dublin this evening.
Keita, another expensive new signing, looks tailor-made for Klopp's team and for the Premier League. The Swiss with the well-developed upper-body looks an appropriate back-up for either of the wider positions - Salah, or Sadio Mane - in Klopp's trusted front three.
Adam Lallana is upbeat about Liverpool's prospects in the upcoming season.
Whereas Firmino is fain to drop deep and leave space for Mane and Salah, Sturridge spends far longer facing the opposition goal.