Speaking to reporters at a press conference on Monday, Schlotterbeck said: "I've known Jona for a few years now and I'm always happy to play with him. We complement each other well.
"Jona is very communicative on the pitch and simply important to me. Defensively, he has been a very strong defender for years now and has done extremely well. For me, the ball-playing aspect is perhaps a bit more interesting than for him. He's perhaps a better defender, though. That's why it's a good fit."