PSG won the first-leg of their Champions League quarterfinal 2-0 through goals from Desire Doue and Khvicha Kvaratskhelia.
Slot said afterwards: "Probably I have to refer to last season what gives me the best feeling, and I have to refer to the history of this club: how much impact Anfield can make for a performance. We were outplayed here last season, which led to a 1-0 win from us, which was unbelievable. Paris Saint-Germain was by far the better team today and could have scored more than two goals.
"But the good thing was that the players of Liverpool today showed fighting spirit, kept going, every time or almost every time when they had a shot we had a lot of bodies behind the ball or protecting our box, which was necessary because what we said: if you don’t track back, if you don’t run back, these players, like the ones from (Manchester) City, are able to hurt you a lot.
"So, last season at Anfield we played a completely different game, after 10 minutes we could have been already 2-0 up. But we need to have a better performance and we definitely need our fans to help us to create an atmosphere where we can rise to a better level than we did in this game."
On the decision to play three at the back on the night, Slot continued: "They have pace from everywhere, all the pitch, so it doesn’t just matter where you look you see pace and incredible pace.
"(Achraf) Hakimi and Nuno Mendes are unbelievable offensive threats apart from all the others. So, we played them with Jeremie Frimpong and with Milos Kerkez, so that was the thought behind it. And that way I thought we could try to press them really high and aggressive because Jeremie and Milos are also two players… if you press Hakimi and if you press Nuno Mendes they play and they start to run more. They don’t start to run, by the way, they start to sprint and actually it’s not even sprinting, it’s just a level above sprinting and you have to cope with that."
Meanwhile, Slot left Mohamed Salah on the bench on the night, even turning to fellow substitute Trey Nyoni over the Reds great.
He explained: "I think in the last part of the game, it was more about surviving for us than there was ever a chance that we could score. Yeah, you never know, because last season we scored five minutes before the end, Harvey Elliott (scored) when I took Mo off.
"But I think this was a 20, 25 minutes where we were only defending and Mo has so much quality, but for Mo to be 20, 25 minutes defending inside his own box, I think it’s better for him to save his energy for a lot of games that are coming up in the upcoming weeks."