Jurgen Klopp saluted the first showing from Kostas Tsimikas as Liverpool beat Stuttgart 3-0.
The Reds were comfortable winners in their opening pre-season friendly out in Austria.
And the new Greek recruit came on at half time as Klopp made wholesale changes after the break.
Tsimikas looked solid in his 45-minute runout and impressed the new boss.
Klopp said: "Good, good. He is a pretty quick player and pretty confident, how you will hear in his [post-match] interview.
"But he is a good player - a really good player - and he did well. The next challenge for him is now to get used to our defending and things.
"It will take time, no doubt, but when he has the ball it looks not so bad."
Strikes from Roberto Firmino, Naby Keita and Rhian Brewster wrapped up the victory.
And Klopp was taken with plenty of performances on the night.
He said: "How we made the goals, I would say that was absolutely exceptional. Obviously Taki [Minamino] is in pretty good shape, Kostas showed some nice glimpses of his talent.
"We know we have good boys here. Curtis [Jones] first half [was] obviously around the goals, Harvey [Elliott] hard-working until the end, Rhian could have shot here, but they look really promising.
"They had to work and that's what they did, so I'm fine with the performance."
The rain battered down during the opening stages of the clash.
But Liverpool managed to remain slick despite the adverse conditions and that was not lost on the boss.
Listen to the Liverpool 3 Stuttgart 0 Post-Game podcast by clicking HERE
Klopp explained: "I'm very happy, very happy. It was a super intense session for us because the weather, wow, it rained like crazy, the pitch was really difficult - you could see the water was still on the pitch.
"That makes football games always tricky. Good organised opponent obviously but we scored nice goals and for me most important was that we felt 45 minutes [of] football is different to a 90-minute session, because in sessions you make breaks, drinks break.
"Here is no break, so you just have to go through. That was the most important thing to do and the boys did it, they felt the intensity of the game – very good."
Klopp indicated that his squad got through the game without any issues - aside from a knock for Ki-Jana Hoever.
He told the club website: "I think Ki-Jana rolled the ankle a little bit but apart from that they all should be fine, which is obviously very important."
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