The Reds beat Preston North End 2-0 at Deepdale on Wednesday night to secure a place in the last eight of the competition, with goals from Takumi Minamino and Divock Origi damaging the hosts.
Klopp made 11 changes for the game and gave senior debuts to Tyler Morton and Harvey Blair, 18, before bringing in Owen Beck, Conor Bradley and Elijah Dixon-Bonner in the second period.
Deputy boss Pep Lijnders explained on Tuesday how international breaks were the perfect opportunity for Klopp and his team to see the Academy’s emerging talent up close.
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November’s gap in the fixture list gives Kirkby’s youngsters the opportunity to claim a claim ahead of the quarter-finals, Klopp said.
Klopp said: “Elijah did just that on the last international break, he was absolutely amazing.
“He’s been at the club for a while now but wasn’t really on the radar and all of a sudden he’s here and he deserved his minutes tonight.
“For a young boy, it’s a huge thing to play his first game for the first team.
“So I’m very happy that he’s giving him the opportunity. There is always a place for these young players.
“Going back to the pre-season, some really impressed like Conor did and yeah, it’s good to have them.
“The problem is, the international break means some of them are already on tour with their national teams, so they can’t train with us, but the others can and that’s good.
“I have no idea of the team [for the next round], it will depend on the situation.
“I don’t think we could have lined up completely differently tonight.
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“Obviously Diogo Jota and Roberto Firmino were there, but it wasn’t really the plan to bring them, we wanted to get by without them.
“So we’ll see, I really don’t make these decisions two or three weeks before the game. “
The Reds boss also explained the thinking behind the decision to replace Joel Matip at half-time at Deepdale, confirming that there is no injury issue on the fit center-back.
“Nat Phillips played very well but Joel is not injured,” he added.
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“We just wanted to keep the pace and it was always the plan to bring Nat in because we just have to let him out.
“So we could see he’s a first-class center-back tonight.
“Conor Bradley is a really talented player with a real heart and he’s smart, but for Harvey it wasn’t easy tonight in the first half because we didn’t play.
“It wasn’t a forward game and you can see everything that can happen, but we saw that when Neco Williams played a little higher we had more targets. “
Liverpool will discover their opponents for the last eight on Saturday, with the draw due to be made on Sky Sports’ Soccer AM.