Speaking to reporters, the German manager said, "Of course, it’s the (experienced) dressing room but it is also the structure we set out on the pitch. It has developed a lot during the season. You can see we don’t change the way we play and so the boys know what they have to do.
"If they don’t play they at least train in the same way so that when they step out onto the pitch they know exactly what to do. It is not always something different. The players have changed but we haven’t. We play the way we want to play. That helps a lot. We did it from the first day of the season and it has made a lot of difference."
He added, "We have found a really good way to play with this group of players - and it was obviously the right thing for the whole squad. Not just the first 11. That’s why we have been pretty stable."