The defender has given a glowing assessment of his new coach while discussing his relationship with Mats Hummels and Neven Subotic
The Greek defender joined the club from Werder Bremen this summer and has been impressed with his new coach in the short time they have worked together.
"Klopp and his coaching staff are among the best in the world for," the Greece international told Bild.
"Their presence makes me satisfied to be here at Dortmund. I am learning a lot of things here."
The defender then went on to briefly discuss his relationship with fellow defenders Mats Hummels and Neven Subotic, insisting the three get on well despite the fierce battle for the two centre-back starting berths.
"I have a good relationship with both Mats and Neven. We only seem to have good players here, both as human beings here and as athletes."
The 25-year-old has made two appearances for Dortmund so far this season, with the club winning both of their opening games and occupying top spot in the Bundesliga.