The Dane has stepped in with David Luiz suspended.
He said, “When I was younger, my teams always played four at the back and then in the first season in Gladbach, we changed from four to three and played that through almost the whole season.
“I was the middle player, so I know that position.
“It is a little bit different what different managers want from a player who plays there but in general it is the same position."
On his spell with Borussia Monchengladbach, the Denmark international defender added: "I played almost every game and in the Champions League we had difficult groups with Barcelona, Man City, Juventus, Celtic and Sevilla.
"So there were some tough games and it was hard to get something out of them but we did what we could and I enjoyed that two-year loan spell."