It's a homegrown product who was brought up from the youth team who Klopp rates the best.
"It's Trent [Alexander-Arnold]," Klopp tells the Pure Football Podcast.
"We didn't have to buy him but Pep Lijnders my assistant brought him around and said: 'He played No.6 [role] for me. He played full-back, he played right wing, left wing'.
"Then he came and there was only one problem: Trent was not fit enough.
“But he was a kid so he was not fit enough but we saw immediately, wow, football wise no doubts.
"But [he was] not fit enough so we had to work on that. But then he made steps by himself that were really unbelievable and that was really nice to see.
“Then he made mistakes and didn't give up."