However, he admits there's room for improvement from the Scot.
Klopp said: "I think you could see exactly what he's good in and where he has to improve in 45 minutes. Speed, football-wise, he's flexible and good [with] crosses, that's really important. We are a dominant football team, or want to be a dominant football team, so we need players who can make the difference on the wing.
"He's good in defence but in one or two situations [he wasn't] but it's always like this. We left him alone, like we left Alberto Moreno alone in the first half, and then Hertha are too strong, they have too many options inside, outside, through the legs, whatever.
"He needs to improve but he's a really good boy with a lot of perspective. I'm happy to have him around."