The win saw the Reds reach the quarterfinal round 4-1 on aggregate.
Slot said afterwards: "From start to finish, I think we played the game I was hoping for, the players were hoping for and the fans were hoping for.
"Not only we played from start to finish the perfect game, but our fans as well. From the start, they were not accepting what we thought would happen and what happened – that they tried to create a situation where the energy would run out of the stadium by making sure there was not much playing time.
"Our fans reacted great to that and our players kept on going, so a great dynamic between fans and players and almost the perfect game from us – and definitely from our fans."
Mohamed Salah scored after missing a first-half penalty and Slot also said: "That can sometimes be hard for an individual or for a team, so compliment to the team for how we came out in the second half because we've had a lot of setbacks this season, we've had a lot of first or second halves where we've created chance after chance after chance without doing justice to how we've performed, so not scoring.
"Then, Mo and the team came out in the second half the way they did. He assisted first to Hugo, a great assist, and then scored a trademark goal, which he scored many of in this stadium and for this club, coming inside and finding the top corner. That tells you about the mental strength of him, but definitely also of the team because adversity is something we can talk about when it comes to this season."
Asked about Salah's substitution, he added: "Injury-wise, he was asking for a substitution, not because he thought he had scored enough but that he felt something, so let's see where he is for the weekend and afterwards."