The Germany attacker completed his switch from Bayer Leverkusen on Friday.
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Asked about the deal, former Reds manager Klopp says he is convinced it will prove a big success.
"This is going to be absolutely fantastic. I'm sure of it," Klopp told RTL/ntv.
"It's very hard to strengthen a team when you're champions. But Liverpool have managed it. They've signed an exceptional talent in Florian Wirtz. I'm looking forward to seeing it.
"It's going to be great."