Liverpool won the first game 4-1 and the second 3-2.
Goals from Rio Ngumoha, Darwin Nunez, Ben Doak and Harvey Elliott saw the Reds win the first game. Then later in the evening, Cody Gakpo struck twice in the second half after Mohamed Salah's 14th-minute opener to clinch a 3-2 victory in game two.
Slot later told the club's website: "I think in both games we created a lot of chances, scored seven goals – four in the first, three in the second – so that's very pleasing to see because we definitely didn't score every chance we had.
"Especially in the second game in the first half, I think we could have scored a few goals more than we did. So that pleased me most, the ability to create the chances and even to score seven goals over two games is also good."
Slot also stated: "I think there's always room for improvement in every department. Like I said, we've added a few, in my opinion, extra weapons. So, Florian (Wirtz) has a lot of creativity in the final third. We've lost with Trent (Alexander-Arnold) a lot of creativity from the back. Trent's crosses and picking out runners was so special – I think Flo has this quality as well in a totally different position. But he brings that creativity, the pace of Hugo, the pace of both full-backs – Milos (Kerkez) and Jeremie (Frimpong) today.
"Like I said, you need to make in everything you do the next step because our competitors are not sitting still as well – not only they try to improve as well but they have also made a lot of signings, like we all have done. So that's why it's going to be a very interesting Premier League in the upcoming year again."